Following up on this: I see similar behavior for Aqara illuminance sensors (lumi.sen_ill.mgl01): they went down to 0 % regularly - especially those which run for a longer time now (almost 3 years!).
Can we eliminate those 0 % reportings for that hardware too (like we did in Ignore invalid Aqara -100 temperature by amelchio · Pull Request #6723 · dresden-elektronik/deconz-rest-plugin · GitHub)?