YouTube shortcuts not working on Safari with French layout anymore

Hello, everyone.

My name's Quentin. I am the owner of a M1 MacbookAir I bought used and I upgraded to Sonoma.

I am really glad to use it. However I noticed something wrong.

When using the YouTube shortcuts 3 and 4 with Safari and the French keyboard layout, they don't work anymore. However, while using Firefox with this layout, they do work ; and when I switch to another layout on Safari, they also do work.

I have emptied the YouTube cache on Privacy menu, but it didn't solve the problem.

I also reinstalled Sonoma, but it didn't help.

I found on Reddit the adblockers can disturb Safari, so I deleted them, but it didn't solve it.

I told someone with the same computer: he answered me he never had this problem (thus, his one is running on Monterey).

I updated Sonoma, but I didn't solve the problem.

What do you recommend to do?

Have a good day.