about text editing system bug

Hi, I'm trying to edit the text in the beta version of the software.
I have tried using the text editing feature of the beta version, but I cannot edit cut & extract, delete, etc. from the text.
When I select the text I want to delete and right click and select the "cut and extract" item, it is not deleted from the timeline or from the text.
The computer I am using is Windows, version 11, and text which I use in premire pro bata is in Japanese.
I would appreciate it if you could improve the situation.