WebGL Develop.asm.framework.js:2 [Physics.PhysX] Gu::ConvexMesh: Error computing mesh mass propertie

I am getting the following error when running a WebGL build neither a clue what to do with it nor how to solve it.

Gu::ConvexMesh: Error computing mesh mass properties!
_JS_Log_Dump @ WebGL Develop.asm.framework.js:2
B1a @ WebGL Develop.asm.js:6
F1a @ WebGL Develop.asm.js:6
y1a @ WebGL Develop.asm.js:6
x1a @ WebGL Develop.asm.js:6
Hbg @ WebGL Develop.asm.js:19
beg @ WebGL Develop.asm.js:19
DBg @ WebGL Develop.asm.js:15
uBg @ WebGL Develop.asm.js:15
tBg @ WebGL Develop.asm.js:15
HBg @ WebGL Develop.asm.js:15
wzg @ WebGL Develop.asm.js:15
g_h @ WebGL Develop.asm.js:29
f_h @ WebGL Develop.asm.js:29
e4h @ WebGL Develop.asm.js:26
L5d @ WebGL Develop.asm.js:12
t4d @ WebGL Develop.asm.js:12
mfb @ WebGL Develop.asm.js:6
gfb @ WebGL Develop.asm.js:6
Peb @ WebGL Develop.asm.js:6
Meb @ WebGL Develop.asm.js:6
Keb @ WebGL Develop.asm.js:6
oUa @ WebGL Develop.asm.js:6
sEe @ WebGL Develop.asm.js:11
sEe @ WebGL Develop.asm.js:11
sEe @ WebGL Develop.asm.js:11
sEe @ WebGL Develop.asm.js:11
sEe @ WebGL Develop.asm.js:11
rEe @ WebGL Develop.asm.js:11
UGe @ WebGL Develop.asm.js:9
requestAnimationFrame (async)
requestAnimationFrame @ WebGL Develop.asm.framework.js:2
Browser_mainLoop_scheduler_rAF @ WebGL Develop.asm.framework.js:2
Browser_mainLoop_runner @ WebGL Develop.asm.framework.js:2
requestAnimationFrame (async)
requestAnimationFrame @ WebGL Develop.asm.framework.js:2
Browser_mainLoop_scheduler_rAF @ WebGL Develop.asm.framework.js:2
Browser_mainLoop_runner @ WebGL Develop.asm.framework.js:2
requestAnimationFrame (async)
requestAnimationFrame @ WebGL Develop.asm.framework.js:2
Browser_mainLoop_scheduler_rAF @ WebGL Develop.asm.framework.js:2
Browser_mainLoop_runner @ WebGL Develop.asm.framework.js:2
requestAnimationFrame (async)
requestAnimationFrame @ WebGL Develop.asm.framework.js:2
Browser_mainLoop_scheduler_rAF @ WebGL Develop.asm.framework.js:2
Browser_mainLoop_runner @ WebGL Develop.asm.framework.js:2
requestAnimationFrame (async)
...

Once I interact with the Game and it starts rendering (triggering the transition from StartScreen to the actual Game, enabling GameObjects etc.), the following exception is thrown:

There’s no problem with any other Build-Type (Windows, Mac, Android).

Unity Version: 2020.3.0f1
Compiled with Cloud build

It says PhysX error, but I don’t think PhysX supports WebGL.

I reset a few changes to prefabs and the exception is no longer thrown. But I now get another “TypeError …” .