MC Version: 1.16.5
C&B Version: chiselsandbits-1.0.12-RELEASE-universal.jar
Do You have Optifine: No

Place bits:

Delete all:

See a ghost block (waila) staying behind:

The ghost block can only be removed in creative mode.

I will do some research as to what the cause could be here.
Obviously this is not correct.

Workaround: Without going into creative mode, I can place another block (e.g. cobblestone) in the same spot and then break that.

Besides this I also checked in into the Radial menu scaling stuff.
With regards to this I am not sure what I can do.

Mojang has implement the GUI scale as a hard scaling option, which I have no real control over......

Closed in #825 released in 1.2.65