If you try to display the corresponding table definition in a debug session using ctrl+click over a table name, the application hangs. Only a wait cursor is shown and no more input is accepted. The application must be terminated using the task manager.
If requesting a table definition while debugging is not allowed, ctrl + click should have no effect.

(Beta 2 windows 10 21H1 64 Bit)

I can indeed reproduce this using "Single Session" mode. Can you confirm that you are using this Session Mode (Preferences > Oracle / Connection)?

Yes I can confirm that. I use "Single Session" mode.

Okay. We'll fix it.

fixed in beta 3

We have not yet fixed this, and it seems that I can still reproduce it in Beta 3. It will probably be resolved in Beta 4.

I've now tested it again. In my current constellation it works. However, this action takes a lot of time.
The only changes: I'm using beta 3 and a color mode (previously with style <none>).
I'm sure I've made some small changes, but I can't think of anything relevant to the behavior.