I have the latest version of Forge (1.16.4-forge-35.1.4) and in my create-automatic blocks are duplicated, but they do not drop when mined and disappear when the world is reloaded.

The video about it:
(sorry for the size of the video)
Minecaft.mov

This issue has been marked as stale because it has been inactive for 3 weeks. It will be closed if it remains inactive for another 3 weeks.

This issue has been closed since it has been inactive for 3 weeks since it was marked as stale.

seems like the ghostblocks which can/could be created in Vanilla with pistons

So this is not a bug of Create and does not need to be reported here!?

...or do you need more information?

well, Im not part of the team´, just something I noticed :/

Even with the new version of Create (v0.3e), exactly the same bug still exists.