diff --git a/koreader-plugin/bookorbit.koplugin/bookorbit_activity.lua b/koreader-plugin/bookorbit.koplugin/bookorbit_activity.lua
index 8f2a5e618..202e315b6 100644
--- a/koreader-plugin/bookorbit.koplugin/bookorbit_activity.lua
+++ b/koreader-plugin/bookorbit.koplugin/bookorbit_activity.lua
@@ -20,6 +20,7 @@ local SUCCESS_TEXT = {
     progress_push = function() return _("Sent reading progress") end,
     progress_pull = function() return _("Pulled reading progress") end,
     connection_test = function() return _("Connection test passed") end,
+    lifecycle_unmatched = function() return _("Skipped a book not in BookOrbit") end,
 }
 
 local ERROR_TEXT = {
diff --git a/koreader-plugin/bookorbit.koplugin/main.lua b/koreader-plugin/bookorbit.koplugin/main.lua
index 294ec2219..83ba0d27e 100644
--- a/koreader-plugin/bookorbit.koplugin/main.lua
+++ b/koreader-plugin/bookorbit.koplugin/main.lua
@@ -474,9 +474,20 @@ function BookOrbit:requestLifecycleOutboxDrain(source, interactive)
                         if finished then return end
                         finished = true
                         local latest = outbox:readLatest(started.id)
-                        local complete = outbox:isComplete(latest)
+                        local unmatched = err == "unmatched"
+                        local complete = unmatched or outbox:isComplete(latest)
                         if complete then
                             outbox:removeEntry(started.id)
+                            if unmatched then
+                                local last_error = self.settings.last_error
+                                if last_error and last_error.event == "lifecycle_outbox"
+                                        and last_error.code == "outbox_blocked" then
+                                    self.settings.last_error = nil
+                                end
+                                BookOrbitActivity.recordSuccess(
+                                    self.settings, "lifecycle_unmatched", snap.title)
+                                G_reader_settings:flush()
+                            end
                         else
                             outbox:markFinished(started.id)
                             self:scheduleLifecycleOutboxRetry()
@@ -494,7 +505,7 @@ function BookOrbit:requestLifecycleOutboxDrain(source, interactive)
                             end
                         end
                         done()
-                        if complete and not err then
+                        if complete and (not err or unmatched) then
                             self:requestLifecycleOutboxDrain("recovery")
                         end
                     end
diff --git a/koreader-plugin/spec/bookorbit_lifecycle_unmatched_test.lua b/koreader-plugin/spec/bookorbit_lifecycle_unmatched_test.lua
new file mode 100644
index 000000000..696e5c4ee
--- /dev/null
+++ b/koreader-plugin/spec/bookorbit_lifecycle_unmatched_test.lua
@@ -0,0 +1,134 @@
+package.path = "koreader-plugin/bookorbit.koplugin/?.lua;" .. package.path
+
+local removed = 0
+local finished = 0
+local recorded_errors = 0
+local flushes = 0
+local entry = {
+    id = "entry_f57f1d89ea1f37a9c43b68371cb7899d_1000_1",
+    generation = 33,
+    attempts = 32,
+    acknowledged = {
+        match = false,
+        stats = false,
+        annotations = false,
+        state = false,
+        progress = false,
+    },
+    snapshot = {
+        digest = "f57f1d89ea1f37a9c43b68371cb7899d",
+        file = "./help/quickstart-C-v2026.07.2.html",
+        title = "KOReader Quickstart Guide",
+        stats_ids = {},
+        annotations = {},
+    },
+}
+
+for _, name in ipairs({ "device", "dispatcher", "ui/widget/infomessage", "pluginshare",
+    "ui/trapper", "logger", "ffi/sha2", "bookorbit_api", "bookorbit_catalog",
+    "bookorbit_lifecycle_outbox", "bookorbit_open_annotation_scheduler", "bookorbit_state", "bookorbit_stats_reader",
+    "bookorbit_sync_coordinator", "bookorbit_sync_job_runner", "bookorbit_menu_pin" }) do
+    package.loaded[name] = {}
+end
+package.loaded["gettext"] = function(text) return text end
+package.loaded["ffi/util"] = {
+    template = function(text, ...)
+        local values = { ... }
+        return (text:gsub("%%(%d+)", function(index)
+            return tostring(values[tonumber(index)])
+        end))
+    end,
+}
+package.loaded["ui/widget/container/widgetcontainer"] = {
+    extend = function(_, value) return value end,
+}
+package.loaded["ui/widget/notification"] = { notify = function() end }
+package.loaded["ui/network/manager"] = {
+    isConnected = function() return true end,
+}
+package.loaded["ui/uimanager"] = {
+    nextTick = function(_, callback) callback() end,
+}
+package.loaded["libs/libkoreader-lfs"] = {
+    attributes = function() return nil end,
+}
+for _, name in ipairs({ "bookorbit_main_menu", "bookorbit_progress_sync", "bookorbit_updater" }) do
+    package.loaded[name] = { install = function() end }
+end
+package.loaded["bookorbit_annotations"] = {}
+package.loaded["bookorbit_bookmarks"] = {}
+package.loaded["bookorbit_highlight_summary"] = {
+    add = function(summary) return summary end,
+    addBookmarks = function(summary) return summary end,
+    hasRemoteChanges = function() return false end,
+    hasRemoteBookmarkChanges = function() return false end,
+}
+package.loaded["bookorbit_sidecar"] = {}
+package.loaded["bookorbit_sweep"] = { isRunning = function() return false end }
+package.loaded["bookorbit_sync_coordinator"] = { PRIORITY = { lifecycle = 300 } }
+package.loaded["bookorbit_state_manager"] = {
+    setAccount = function() end,
+    getBook = function() return nil end,
+}
+package.loaded["bookorbit_book_sync"] = {
+    isRunning = function() return false end,
+    run = function(opts)
+        opts.on_finish("unmatched")
+        return true
+    end,
+}
+
+local outbox = {
+    nextEntry = function()
+        if removed > 0 then return nil end
+        return entry
+    end,
+    readLatest = function()
+        if removed > 0 then return nil end
+        return entry
+    end,
+    markStarted = function() return entry end,
+    isComplete = function() return false end,
+    isBlocked = function() return true end,
+    removeEntry = function()
+        removed = removed + 1
+        return true
+    end,
+    markFinished = function() finished = finished + 1 end,
+}
+
+G_reader_settings = { flush = function() flushes = flushes + 1 end }
+package.loaded["device"].model = "Kindle"
+
+local Plugin = dofile("koreader-plugin/bookorbit.koplugin/main.lua")
+local plugin = setmetatable({
+    settings = {
+        server_url = "https://example.invalid",
+        username = "reader",
+        userkey = "secret",
+        last_error = {
+            event = "lifecycle_outbox",
+            code = "outbox_blocked",
+            message = "A pending lifecycle sync keeps failing and was parked.",
+        },
+    },
+}, { __index = Plugin })
+
+plugin.getLifecycleOutbox = function() return outbox end
+plugin.submitSyncJob = function(_, job) job.run(function() end) end
+plugin.scheduleLifecycleOutboxRetry = function() end
+plugin.recordSyncError = function()
+    recorded_errors = recorded_errors + 1
+end
+
+plugin:requestLifecycleOutboxDrain("manual", true)
+
+assert(removed == 1, "an unmatched lifecycle entry is removed")
+assert(finished == 0, "an unmatched lifecycle entry is not parked again")
+assert(recorded_errors == 0, "an unmatched document does not produce a lifecycle error")
+assert(plugin.settings.last_error == nil, "the stale parked warning is cleared")
+assert(plugin.settings.activity_log[1].kind == "lifecycle_unmatched", "the skip is visible in Sync status")
+assert(plugin.settings.activity_log[1].sub == "KOReader Quickstart Guide", "Sync status identifies the document")
+assert(flushes == 1, "the resolved lifecycle state is persisted")
+
+print("bookorbit_lifecycle_unmatched_test.lua: ok")