FS operations fail on latest version on Chrome Canary/Edge

**Describe the bug**
MemFS appears to be broken in latest version of ffmpeg.wasm on Chrome Canary and Edge. FS operations throw "Oops, something went wrong in FS operation".

**To Reproduce**
Steps to reproduce the behavior:
1. Install, create and load ffmpeg.wasm as usual in Chrome Canary or Edge
2. Run any FS operation using the FS function
3. Profit

**Expected behavior**
You probably know what it should do.

**Desktop (please complete the following information):**
- OS: Windows 11 Pro Insider Preview Build 25267
- Browser: Chrome Canary
- Version: 112

**Additional context**
I cannot remember this happening a few weeks ago, might be a browser problem?