When using the Gin admin theme, the page title shows visible markup tags

I was able to reproduce the issue using the steps provided. The fix is working for me. Thank you!

We are already using it in production. It's working as expected.

It's probably worthwhile to take a look and see what Gin's preprocess hook is doing. Is it important? Should we instead switch to a different (less likely to be overridden) implementation like maybe hook_process()?

just to reconfirm.
Before

And After

Automatically closed - issue fixed for 2 weeks with no activity.