Rendering a replay with an overwrite of an existing file that is busy (e.g. used in After Effect for my case) will cause the mod to fail the render and crash the game.

Used Replay Mod on 1.18.2 (v2.6.8) with Fabric + Sodium (replaymod compatible) v0.4.1 and a bunch of other mods for game graphics that I believe don't really have effect on the said issue