CPU: Intel Core i5-7300HQ
GPU: GTX 1050
OS: Windows 11 (TPM/Secure Boot check disabled)
Launcher: Vanilla
Loader: Quilt

I decided to use MCBrowser to bring up a map of my server, but the game crashed with this error.

The game crashed whilst unexpected error
Error: java.lang.RuntimeException: Chromium Embedded Framework was never initialized.

It was working fine before, so I assumed it was because I booted directly into the server. Considering the fact that MCEF is normally initialized before the title screen, I'm guessing this is a simple oversight.

Yeah, that's a tricky one and a definite oversight. Thanks for reporting.