r3dfox - Login issue with version 150.0.1

I am working with Windows 7 pro 64bit v6.1.7601 SP1
I have to log in to the online shop of the German postal service Deutsche Post.
Login works with following - fresh downloaded - versions of the portable r3dfox:

• r3dfox-149.0.2.en-US.win64.portable
• PortableApps r3dfoxPortable148.0.2

... and also with Google Chrome Version 109.0.5414.120 (Last portable version working with Windows 7)

Login does not work with the following - fresh downloaded - versions of the portable r3dfox:

• r3dfox-150.0.1.en-US.win64.portable
• PortableApps r3dfoxPortable150.0.1
• PortableApps r3dfoxPortable149.0.2

The German postal website application acknowledges my login attempts with the message “Access failed” (in original German language: "Aufruf fehlgeschlagen") followed by a changing error code 0.8c341602.1778159821.af5552f as well as my IP address.

I replicated it multiple times with each version.

What could be the reason why login works on some versions of the portable r3dfox but not on others?

Best regards
Benuzar