Mods installed: Forge 1.16.1 (32.0.98 beta); Voxelmap 1.10.7 (latest). I had been using Optifine as well, but removed it in the hopes that it would help (it did not)
When I load the Forge install, Minecraft hangs for a while (between "Reading World Data" and the loading square appearing) and eventually crashes when attempting to load my main world (Finlandia). I can play on my Creative test world with no issues, and my other two survival worlds also launch with no problems. If I use the vanilla install, everything's good all the way around.
Issue started after hard restarting my computer (used the restart button on the case) while playing Minecraft
Debug.log: https://pastebin.com/xnUniYpE
I don't know what process owns com.electronwill.nightconfig but that's where the exception gets thrown in the debug.
The information approximately between timestamps 06:29:57 and 06:30:18 are from me loading my Creative Test world to verify that it functions on the Forge install; disregard this.
I've been looking around to find a solution but have gotten nothing yet