I didn’t switch to Table Routing after @balloob@fosstodon.org didn’t recommend it:
Instead I had rolled back to a Hue bridge for a subset of my network with no success. Problem remained. Motion sensors dropped of the net after a few days.
I am so sick of this problems, that I switched to radar-based presence detection via Aqara FP2. One FP2 worked as a PoC for me since nearly 2 yrs for an approx. 60 sqm area and it works like a charm.
So, the time of PIR sensors is (almost) completely over for me: Only three sensors remain from in total 14 before.