diff --git a/changelog/3660.changed.md b/changelog/3660.changed.md
new file mode 100644
index 000000000..e5077b73b
--- /dev/null
+++ b/changelog/3660.changed.md
@@ -0,0 +1 @@
+- Moved interruption wait event from per-processor instance state to `InterruptionFrame` itself. Added `InterruptionFrame.complete()` to signal when the interruption has fully traversed the pipeline. Custom processors that block or consume an `InterruptionFrame` before it reaches the pipeline sink must call `frame.complete()` to avoid stalling `push_interruption_task_frame_and_wait()`. A warning is logged if completion does not happen within 2 seconds.