Steps to reproduce
$$e=mc^2 \label{eq0}$$
works fine. However, if you edit anything under this label, e.g. change it to:
$$E=mc^2 \label{eq0}$$
It will cause an error in the preview.
Expected result

Actual result

Environment
- Operating system: Windows 10
- Obsidian version: v0.12.15
Additional information
If I change the name of the label to another one that I have never used, it will solve the problem. It’s just I can never use any label after I have used it once. Even using ctrl+z cannot change this back.
I just downloaded Obsidian and haven’t installed any plugin.