Automated update (population) of that dialog from text selection was a fine feature. Now having to click the button [Update entry from selection] makes work slower. It is not such a keen improvement.
Adding this button seems like a good idea because in previous versions, you had to select the text and then click in the
Entry field to update the field.
This was not at all intuitive. Many people closed the dialogue and then reopened it.
On the other hand, I agree with you that there was no need to disable the update by click.
I searched the base of the bugs but I did not find anything on it. Do not hesitate to report this request.