I upgraded from Picard 2.5.6 to 2.6.3 and when starting Picard after the installation it shows a dialog window with the error message: "Failed to execute script tagger"

Running Picard with -d, the debug log shows the following error:

D: 11:45:31,409 tagger.main:1002: Looking for Qt locale de_DE in C:/Program Files/MusicBrainz Picard/PyQt5/Qt/translations
Traceback (most recent call last):
File "tagger.py", line 19, in <module>
File "tagger.py", line 1009, in main
File "tagger.py", line 395, in run
File "browser\browser.py", line 111, in start
File "socketserver.py", line 452, in _init_
File "http\server.py", line 139, in server_bind
File "socket.py", line 676, in getfqdn
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xfc in position 1: invalid start byte

Please find attached the debug log.