IDK for HA, but there was a beta release today with new firmware Release v2.29.3-beta · dresden-elektronik/deconz-rest-plugin · GitHub
New beta firmware version 0x26540900 for ConBee III to fix pairing and lost devices issues and various other improvements Firmware Changelog
New Beta - 2.29.3 - installed, waited, 8 hours later - still the same, no more updates from xiaomi sensors!
I really would appreceate to get a feedback form one of you DE guys.
Thank you.
The update is about the firmware, but it’s a firmware for conbee 3 only, and you are using a conbee 2 if I m right.
I have conbee 3 and will try the beta later, thanks for pointing it out
Well, what can i say. I am really happy to tell that since 2.29.4 the problem with Xiaomi sensors is gone.
Thanks DE guys 
Yes, I can confirm this also with 2.29.5
the problem is gone with the latest update!