3-layer parquet: Does the back side have cracks and threads?!

I wouldn't do that, it most likely won't fit afterwards anyway

The problem is that we have to move in 3-4 weeks and we have anhydrite screed, which has a residual moisture of 0.6% (0.3% required) and therefore no flooring is installed yet and no kitchen either.... :(

I thought it should be unpacked beforehand so that the parquet absorbs the room humidity - in other words, reaches its future size. (If it was stored extremely dry / wet before).