WARNING AppDaemon: Invalid callback handle 'None' in cancel_timer()

Third party integrations AppDaemon
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After updating to core-2021.4.3 an app I haven’t touched in months suddenly is throwing exception in the main AppDaemon log, but the exception is not making it to the Error log.

2021-04-11 09:30:09.448028 WARNING AppDaemon: Invalid callback handle 'None' in cancel_timer() from app occupancy_living

This is ocurring everywhere I’m using this app, I believe (hard to tell given there is no line number to trace) that it’s a helper timer and I’m using the service call to end it.

self.call_service("timer/cancel", entity_id = self._countdown_entity)

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Same here. Just reverted back to 4.0.5.1 (4.0.7) because these “invalid callbacks” occurred after 4.0.5.2 (4.0.8), not sure yet if this was the reason, but soon will find out.

Edit: probably my bad!
Few months ago I replaced run_in() calls with run_once(), but still store the handle returned by these, and use it to cancel_timer() at the end of the delayed call.
If run_once() already deletes the timer (which is quite likely, otherwise why its name) then this “invalid callback” msg is right.