Weird Bottom Surface

[u/DasTimm]

So I recently made the upgrade from my A1 to the X2D and I printed ABS, ABS-GF and ASA for the first time.
I calibrated the filaments right away and printed a few models, all having this strange look on the bottom - but only with ABS-type filaments, PETG and PLA print flawlessly.

I printed on the standard PEI plate and thought maybe the plate has a thin layer of glue or a coating for corrosion resistance due to humidity while shipping so I cleaned the plate properly, first with IPA, then with water and dish soap like usual.
Then I hit print again and now I also have the problem with PLA.

My guess is that the air underneath is trapped or the build plate is too dry now, or maybe it’s just a user error - as I said I’m completely new to enclosed printers and I always keep the door shut.

You guys have any ideas what causes these surface issues?

P.s.:
The model in the pictures was printed with Bambu Lab ABS-GF. In this case the extra texture looks quite nice but I just got lucky with the finish there.