TC doesn't spawn with a codelock anymore after this update. Maybe the same reason like this one:

https://umod.org/community/extended-recycler/45902-no-longer-turns-into-recycler-when-deployed?page=1#post-2

This will be fixed with the next oxide update coming soon.

For those that have sandbox disabled on there server here's a harmony mod that fixes it without restart:

FixOnEntityBuilt.cs

Players still can access the tc even with the fixonentitybuilt plugin on the server?

That was a hotfix meant for last patch. It is no longer relevant.

So this plugin no longer works?

It should. Remove the FixOnEntityBuilt.cs and try it.

Is it not placing a lock automatically?

It places a lock yes but the issue is right now is they can still access the tc by  holding e and selecting open tc

Meaing anyone who hasn't entered the code?

If you hold e and the onen inv players still can access tc

Did you find a fix yet?