Just checked the events log. All the astro events occured right after disabling the elerotransmitterstick thing…
2021-12-06 17:15:18.345 [INFO ] [ab.event.ThingStatusInfoChangedEvent] - Thing 'elerotransmitterstick:elerochannel:769b2ac958:2' changed from UNINITIALIZED (HANDLER_MISSING_ERROR>
2021-12-06 17:15:18.349 [INFO ] [ab.event.ThingStatusInfoChangedEvent] - Thing 'elerotransmitterstick:elerochannel:769b2ac958:13' changed from UNINITIALIZED (HANDLER_MISSING_ERRO>
2021-12-06 17:15:18.354 [INFO ] [ab.event.ThingStatusInfoChangedEvent] - Thing 'elerotransmitterstick:elerochannel:769b2ac958:1' changed from UNINITIALIZED (HANDLER_MISSING_ERROR>
2021-12-06 17:15:18.358 [INFO ] [ab.event.ThingStatusInfoChangedEvent] - Thing 'elerotransmitterstick:elerochannel:769b2ac958:12' changed from UNINITIALIZED (HANDLER_MISSING_ERRO>
2021-12-06 17:15:18.361 [INFO ] [ab.event.ThingStatusInfoChangedEvent] - Thing 'elerotransmitterstick:elerochannel:769b2ac958:4' changed from UNINITIALIZED (HANDLER_MISSING_ERROR>
2021-12-06 17:15:18.365 [INFO ] [ab.event.ThingStatusInfoChangedEvent] - Thing 'elerotransmitterstick:elerochannel:769b2ac958:15' changed from UNINITIALIZED (HANDLER_MISSING_ERRO>
2021-12-06 17:15:18.369 [INFO ] [ab.event.ThingStatusInfoChangedEvent] - Thing 'elerotransmitterstick:elerochannel:769b2ac958:3' changed from UNINITIALIZED (HANDLER_MISSING_ERROR>
2021-12-06 17:15:18.377 [INFO ] [ab.event.ThingStatusInfoChangedEvent] - Thing 'elerotransmitterstick:elerochannel:769b2ac958:14' changed from UNINITIALIZED (HANDLER_MISSING_ERRO>
2021-12-06 17:15:18.382 [INFO ] [ab.event.ThingStatusInfoChangedEvent] - Thing 'elerotransmitterstick:elerochannel:769b2ac958:5' changed from UNINITIALIZED (HANDLER_MISSING_ERROR>
2021-12-06 17:15:18.397 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:astroDawn#event triggered START
2021-12-06 17:15:18.400 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:morningNight#event triggered END
2021-12-06 17:15:18.404 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:nauticDawn#event triggered START
2021-12-06 17:15:18.408 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:astroDawn#event triggered END
2021-12-06 17:15:18.412 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:civilDawn#event triggered START
2021-12-06 17:15:18.416 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:nauticDawn#event triggered END
2021-12-06 17:15:18.419 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:civilDawn#event triggered END
2021-12-06 17:15:18.423 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:rise#event triggered START
2021-12-06 17:15:18.426 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:rise#event triggered END
2021-12-06 17:15:18.429 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:daylight#event triggered START
2021-12-06 17:15:18.432 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:noon#event triggered START
2021-12-06 17:15:18.435 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:noon#event triggered END
2021-12-06 17:15:18.438 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:daylight#event triggered END
2021-12-06 17:15:18.441 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:set#event triggered START
2021-12-06 17:15:18.444 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:set#event triggered END
2021-12-06 17:15:18.447 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:civilDusk#event triggered START
2021-12-06 17:15:18.450 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:nauticDusk#event triggered START
2021-12-06 17:15:18.453 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:civilDusk#event triggered END
2021-12-06 17:15:18.457 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:astroDusk#event triggered START
2021-12-06 17:15:18.460 [INFO ] [openhab.event.ChannelTriggeredEvent ] - astro:sun:local:nauticDusk#event triggered END
I am quite convinced that the elerotransmitterstick interfers with firing of the astro events. But I am not really sure what causes this. Maybe this is in some kind related to Astro-Binding: all events are triggered at the same time shortly after midnight ?!