Steps to reproduce
Use IME to inserting English in headings (e.g. Use Windows default IME, press “A” and then press “Enter”).
Expected result
Rendered like this:
Actual result
Like this, you can see the A is different; you can click anywhere else to make it render again to be normal.
Additional information
A short GIF:
Environment
- Operating system: Windows 10 20H2
- Debug info: Sandbox Vault