Tried to edit my resource packs in forge 1.16.5 (36.0.1). Hit done, and it seems to be loading the changes, briefly displays the resource pack menu, goes back to the loading screen, and then crashes. Re-launched, and all resource packs were deactivated. Can get them back on by opening without forge, putting them back, quitting the game, re-opening the launcher and opening with forge.
crash-2021-01-22_01.55.11-client.txt