the new slopes have a bug, currently when placing inner and outer slopes and when cutting the inner and outer slope shapes out they simply appear as solid blocks or disappear completely

Can you please share a series of screenshot explaining the issue?

i have the same. sometimes slopes are not correct placed.
undo dont work correct when you place slopes or the new walls and so on.

@punkydie Send screenshots so I can reproduce it.

If that was an issue related to the chisel then this is fixed. If it was something else make sure to post more information here.