Mea cupla - I have created a fix, so I’d suggest to move to the next snapshot instead, if this problem is permanent.
Trying to turn on all upstairs lights now just turns one on. @Kai is this related to the core change to use a threadpool for the rules?
Yes, it seems to be related to that, but actually the change now only provoked to bring this behavior to the surface as it existed before: The rule engine does not permit starting a rule that is already running. My assumption is that before the rules were triggered so quickly that the rule engine actually didn’t notice that they were running in parallel. Logging an error and not doing anything is probably the worst thing to do - let’s discuss on Rules fail to run with multiple triggers · Issue #1868 · openhab/openhab-core · GitHub how to best proceed.