I know that the transition from 1.16.2 to 1.16.3 isn't fully done yet at all places and its not supported by AE2 (and not running on its own because of version problems) but I still tried to run the mods together.

It seems like Placebo is crashing the game when its running together with AE2. Both mods on its own are running but as soon as they are combined the game is crashing. It might be because of that early crash (or other reasons) but the game does not create a crashlog. The test modpack that I created has 72 mods (71 without AE2) and runs fine so that problem seems to only exist with AE2 and no other mods. I contacted them but they said that they can't provide any support because Placebo is a coremod.

latest.log

Minecraft: 1.16.3
Forge: 34.0.1
Placebo: 1.16.2-4.2.0
AE2: 8.1.0-alpha.2

If you need any other informations, please let me know.

//edit: Seems like that bug comes from forge and is already known. I'm closing here.