I've tried using the Deployer item and it crashes the game, and every time I enter that world the game crashes a again. The only way to fix the world is to either open a backup(losing any new progress), Removing the Create mod and reloading world(breaks all create contraptions), or delete the specified chunk(Deletes all progress within that chunk).
This seems
Crash Report:

crash-2021-06-22_12.11.51-server.txt

The Deployer functions normally until it tries placing something. As far as I have tested, It can hold items, and use bonemeal just fine, But when it places something(In this case it was placing an oak sapling), It crashes, as stated above.
I don't know if it's mod incompatibilities, or what, but that's why I'm here asking, Hoping you got a fix.

Updating to the latest version of Forge should fix this issue

It worked, Thanks!