I had the same problem with several temp and humidity sensor and motion sensors (unless i’ve several routers (ikeapanels/bulbs/smartplugs).
I bought a gateway (received it just after the experimental update , covid-19 slowed down the shippings from china ).
I’ve linked all the temp and humidity sensors and motion sensors which didn’t work directly on homey (no reportings or reportings once day/week/month).
Now they are working perfectly (still got several aqara directly linked to homey).
I’ve read somewhere in a forum a suggestion that the motion sensor (with flux meter) is disturbing the connections. I’ve never found proof. My feeling is, somehow homey don’t like too many (aqara) battery devices (“sticking” to the router where they originally paired with in combination with a much weaker zigbee signal from homey (in relation to the gateway?) is also possible (even though some motion sensors were in the same room as homey but still refused to work properly ). I’m hoping the zigbee update will resolve this issue and makes my gateway useless again . Like Ted said, one strong Zigbee mesh is much better than multiple parallel networks.