So basically I was on vacation and when I returned my premiere was updated to 23.5.
Before then I could drag some other sequence in my timeline as nested sequence but right now it just copies files in sequence as they are in that other sequence.
I read 23.5 update poster and there was nothing about changing sequences/nested sequences. This bug or "feature" makes daily editing life more harder cause now for example I can't create sequence in another resolution just to aply warp stabilizer and then implement it sequence with bigger resolution to scale it up (this is just an example).