It seems to be related to this issue : Auv3 resizing issue on macos (not ios) - #15 by peteatjuce
Although I have no idea how to ensure Logic is bridging my plugin to AUv3, the fact the M1-Native plugin runs out of process as well seems to indicate there’s some kind of bridging technology here that Ableton and Reaper don’t do. Furthermore I’ve got the same resizing problem than the one @reuk had at the time of this dev.