In math mode, \Omega is not recognized

### Site

_No response_

### Version

_No response_

### Instance

mathstodon.xyz

### Browser

LibreWolf 152.0.2-1

### Bug description

\(\Omega\) is not rendered correctly.

Original:

Math mode

Post: https://phanpy.social/#/mathstodon.xyz/s/116813076245459652

### To reproduce

_No response_

### Expected behavior

_No response_

### Other

_No response_

Start by opening the linked post on mathstodon.xyz in the reported browser and reproducing the incorrect rendering of \Omega in math mode. Trace the frontend's math-rendering path and compare it with the original rendering; done means the symbol displays correctly in the post.

Written by the indexing model from the issue text.