Keywords sidebar edit panel - does not "read" my selected keyword from the proposed list when I enter keyword that does not exist.

Step by step: 
https://www.imdb.com/title/tt40629192/ 
Click "Edit" besides "storyline"
sidebar opens
plot and quotes
keywords
add keyword
plot detail
add: climbing out window
check these updates

'climbing-out-window' is not one of the existing keywords we have in this section.
Did you mean one of these?

I select:  climbing-out-a-window
check these updates
it reloads 
and I get back to:

"'climbing-out-window' is not one of the existing keywords we have in this section.
Did you mean one of these?"

So it does not seem to "read" the "new" keyword I have selected.

Happens on multiple keywords, so it's not related to this specific keyword.

This started happening today 13. June 2026 , worked fine yesterday. 

Tested on PC in Firefox and in Edge browser