Keep the extension's tick out of REAPER's own project load, and re-earn the park holds across one load

src/app/main.cpp

@@ -183,6 +183,17 @@ static void OnTimer()
     // the idle fast-path is a SINGLE POINTER TEST — drive only when a capture is live.
     if (capture::g_rtCapture) capture::DriveRealtimeCapture(g_session);
 
+    // A project load or save is IN FLIGHT, so this tick is running inside its own message
+    // pump — a restore brings plugins online and a plugin load pumps. Everything below
+    // would then act on a half-restored project: poll() reads the pre-load <EXTSTATE> that
+    // OnBeginLoadProjectState defers past precisely because it is wrong, and the reclaim
+    // tick writes FX into a project REAPER is still rewriting. The extension's other
+    // re-entrancy guards cover OUR pumps; this one covers REAPER's. Consumes nothing, so
+    // the first tick after the load runs as if this one had never been due. Self-lowering
+    // (reaper_plugin_functions.h:1584-1587), and placed after the realtime drive so that
+    // fast path keeps its single-pointer-test shape. See src/shell/view/CLAUDE.md.
+    if (GetCurrentProjectInLoadSave()) return;
+
     // poll()'s undo/redo-reload and project-switch Load branches call
     // loadFromProject, replacing g_session.view() wholesale — deferred here while
     // an applyMode is on the stack (reachable if a pumped message loop re-enters