Thunderbird 78.3.1-1.1 I freezes when I try to empty the trash or try to delete
a single email from the trash, same with the junk folder. Also it freezes when
I try to add a new event to the calendar.

No useful output in the terminal or logs. Removing the ~/.thunderbird folder
and using a fresh created user did not solve it.

But: there are _no_ freezes when I start thunderbird with "LANG=C thunderbird".


My default locale:

cat /etc/locale.conf 
LANG=de_DE.UTF-8


Package info:

Information for package MozillaThunderbird:
-------------------------------------------
Repository     : openSUSE-Tumbleweed-Oss
Name           : MozillaThunderbird
Version        : 78.3.1-1.1
Arch           : x86_64
Vendor         : openSUSE

Information for package MozillaThunderbird-translations-common:
---------------------------------------------------------------
Repository     : openSUSE-Tumbleweed-Oss
Name           : MozillaThunderbird-translations-common
Version        : 78.3.1-1.1
Arch           : x86_64
Vendor         : openSUSE