Yesterday, it seems in mediawiki-core and all extensions there were 100s wmf/1.20wmf21 branches created that were supposed to be wmf/1.25wmf21. This is spreading through various automated tooling and confusing in general. Please remove them again.
Looks like they were created by @mmodell.
https://github.com/wikimedia/mediawiki-extensions-AbuseFilter/commits/wmf/1.20wmf21.
Shortly after the 1.25wmf21 branches were created.
https://github.com/wikimedia/mediawiki-extensions-AbuseFilter/commits/wmf/1.25wmf21