When I try to start up a modded profile I get the following error in Minecraft:

The game crashed: rendering overlay
Error: java.lang.IllegalStateException: Failed to create model for minecraft:skull

I found a post from someone with a similar error, which they resolved by deleting C:\Users\[username]\AppData\Roaming\.minecraft\config\forge-client.toml. While I didn't find this on my computer (no "config" folder in ".minecraft"), I did find C:\Users\[username]\curseforge\minecraft\Instances\[modded profile name]\config\forge-client.toml. Would deleting this fix it, or should I do something else?

The crash log lists Nirvana and Entity Model Features as "Suspected Mods", but I've had both included for a while and don't want to remove either if I can avoid it.

Crash log: https://pastebin.com/svhpa0D2

Make a test without the mod nirvana-forge

I did this and it worked (after I disabled an unused library mod that failed to load).

Out of curiosity I tried it with Nirvana re-enabled, and it worked. I then tried the original profile (with the only change being disabling the aforementioned library mod) and it worked just fine.

Words cannot describe my confusion, but thank you.