Dems pushed it through as a separate bill knowing it would fail rather than packaging it with the other one. Empty posturing, they didn't want it to pass either. Keeping it separate to blame Rs is politically expedient and makes an easy trap for ideologs creating headlines like OP. Hell, they didn't even have to bring it to a vote if they didn't want it to happen.

Even r*dditors are able to recognize this:

https://old.reddit.com/r/antiwork/comments/za1zc6/the_senate_passed_it_80_to_15_railroaders_wont/iylhgzs/

Your premise isn't wrong, our congress absolutely doesn't give a fuck about us or workers rights. Your mistake is falling for the D vs R paradigm instead of recognizing it's a trap to keep us fighting each other instead of them.