Landtag, Bürgerschaft, Bürgerschaft, Landtag, Abgeordnetenhaus – are you aware of the concept of division of powers? These parliamentary initiatives don't matter in any way. They are cheap talk or "Gratismut" because they have no legal consequences, and they do absolutely NOT initiate a proceeding. The government of a state must petition at the BVerfG. You had figured that out by yourselves if you had put in the effort to read any of the links you've posted: none of them creates a law that forces the state's government to act in Karlsruhe. These are "Entschießungsanträge". Nothing more than smoke shows to impress people like you who don't care about the rule of law, or don't know any better. You're really easy to impress and to mislead.
So let me ask you again: why were they willing to create Entschließungsanträge, but why weren't they willing to go to Karlsruhe?
Niedersachsen (Lower Saxony): https://www.landtag-niedersachsen.de/Drucksachen/Drucksachen...
Bremen: https://www.bremische-buergerschaft.de/dokumente/wp21/land/d...
Hamburg: https://www.buergerschaft-hh.de/parldok/dokument/102051/23_0...
Mecklenburg-Vorpommern: https://www.dokumentation.landtag-mv.de/parldok/dokument/648...
And just for completeness' sake, Berlin 2025: https://pardok.parlament-berlin.de/starweb/adis/citat/VT/19/...