Can't add new contents on my Extra field

Agreed. I can reproduce this with the same html (<div><b><i></i></b></div>) in

  1. Anki 24.11 (87ccd24e) (ao)
    Python 3.9.18 Qt 6.6.2 PyQt 6.6.1
    Platform: Linux-6.1.0-0.deb11.21-amd64-x86_64-with-glibc2.31
  2. Anki 25.02 (038d85b1) (ao)
    Python 3.9.18 Qt 6.6.2 PyQt 6.6.1
    Platform: Linux-6.12.19-amd64-x86_64-with-glibc2.41
  3. Anki 25.02 (8fc822a6) (src) (ao)
    Python 3.9.18 Qt 6.6.2 PyQt 6.6.1
    Platform: Linux-6.12.19-amd64-x86_64-with-glibc2.41
    (latest main build from source today)

Edit: I opened a report in Having empty HTML in the add cards fields causes the field to shrink and be unusable.