I presume this is just a leftover bed-default that needs to be disabled.

Not a bug, meant to happen.
Guess i could add a config for it

Ah... it's not really what I would've thought of as "expected behaviour". In Vanilla dimensions, it makes sense that you can't sleep in the nether (and it's very explicit) or the end. In a mining dimension that has a day/night cycle (I think?) it makes a little less sense.

Well better than nothing 1.15.2 now have a config for this, with default allowing sleep