Getting an error "Request failed with status code 404" when trying to add license number, Google Font API, Open AI API etc. under settings.
I have increased the memory limit on the server to 1024M, and that does not help.
Also - problems with caching on browsers especially Firefox - I have to keep clearing internet history. SP Page builder 3.8.10 does not have this problem - is this something you are working on? I have a few clients who like to work on their own sites - and this is going to be a huge problem and many headaches for me.
I also added the following to .htaccess and it helps a little :
<IfModule mod_headers.c>
Header set Cache-Control "no-cache, no-store, must-revalidate"
Header set Pragma "no-cache"
Header set Expires 0 </IfModule>