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Thanks, I didn’t know I had to press ENTER, I’d been doing that mistake (Ctrl-S) for years. Yes I type the keywords and sometimes replace older keywords with new ones. And even if I press ENTER, I still have sometimes to do it more than one time to be correct, sometimes I have to suppress older asterisk many times to get correct keywords.

Please give us a few more details. Are you typing in the keywords (if so, what dialog box are you using)? Or are you clicking in the box to the left of the keyword in the Keyword List panel? Or assigning them via paste metadata or the spray can?

Ctrl-S does not save your keywords. It writes them to XMP. The keywords in Lightroom Classic should be saved automatically to the LrC catalog. If they are not present when you return, perhaps its as simple as you didn’t press ENTER after typing the keyword. (I don’t really know if Ctrl-S saves the keyword to the LrC catalog, I don’t use Ctrl-S). If you come back and the keyword has an asterisk, there is a strong likelihood that this is correct behavior of LrC — if you have selected multiple photos and some of them have the keyword and others do not, you should see the asterisk.