LastIndexOf method can't find index of ";" HELP

Hi, I'm a newbie junior full-stack developer working mainly on the front end using React and JS. I now got assigned to a .Net core (version 5) backend project and my PC got a weird bug??? LastIndexOf method did not work when finding the index of a semicolon only on my pc on the attached picture it could not find the first ";" in the string, We suspected that this might have to do with the fact that I accidentally updated the Visual Studio 2022 version?? but after rolling back to the Previous Version the bug still persisted so far I've tried -rebuild the and clean the solution -Running on the VS code instead, -Reinstalling .net SDK -Re pulled the project repo to my local client -Restarting PC duh We're only able to reproduce the Bug with one of my coworker PC and the only thing we have in common is that we're using AMD CPU I have listed the screenshot that might help This Bug Flabbergasted my Entire Team Thank you !