Gmail authentication stuck on white screen

Regression in Tails 7.4, I get stuck on this screen when trying to add a Gmail account in Thunderbird:

Screenshot_From_2026-01-19_11-39-39

OAuth2 works fine in 7.3.1:

Screenshot_From_2026-01-19_11-45-19

I sent "Bug report: 3cd30b3f5a0e65ef7e26b957379af290" from WhisperBack in 7.4.