Disable auto-insertion of file extension in save file dialog during typing

Since switching to Monterey, whenever typing a filename in a Save File dialog, the system automatically inserts the file extension at the end of the name.

This is a heavy impediment when using keyboard-only to edit the file name. A very frequent use case such as:

• Open Save File dialog
• cmd+a to select current filename text
• Type new filename and hit return

now becomes:

• Open Save File dialog
• cmd+a to select current filename text
• type first letter of new filename
• --> extension of the file is automatically added, and the cursor is placed at the end of the name
• go back to start of the text
• type the rest of the new filename and hit return

It is very detrimental to a fast and smooth use of the save file dialog. Moreover, the vast majority of software automatically assigns any missing file extension to the file. And given that it is a system-wide feature it annoys me on any single software in which I have to create and save files.

I don't need to argue on whether the feature has any benefits to some people (I'm sure a case can be made) although if the cursor was NOT placed at the end of the text that would be massively better. My question is rather: is there a way to disable this? If so where/how?

Thank you so much for any help!