ZIGBEE discovery issue

Hello everyone
For a few days now, I’ve been unable to discover new Zigbee devices on my HA instance. The logs don’t give me too many clues, as there are no apparent errors.
At first I thought it was because I’d deleted a device (NOUS Z2M) only to rediscover it later and that it wasn’t working just for that Device, but that’s clearly not the case.
My HA instance is in VM, version 2024.8.1 (problems started in 2024.7.x) with Mosquitto Broker 6.4.1 and Zigbee2Mqtt 1.39.1-1.
Do you have any idea ?