Some key commands quit working in Dorico 4.3

I cannot understand why, but today, I’ve had some keyboard shortcuts that quit working. Especially 1 and 2 (actually & and é, which are the 1 and 2 buttons without shift pressed) which I use to change the grid resolution.
I’ve been changing Dorico’s language to French to help a fellow Dorician (or Doriconian, that one’s for you, @tristis) on Facebook, in order to give the proper wording in the French version. When I changed back to English, those shortcuts would not work anymore. When I checked, the default shortcuts had come back, so I had to delete them again, and especially the accent and staccato one, because they’re on those keys by default and take precedence over my shortcuts.
Why on earth have those factory shortcuts come back ? Is there a problem to access my user keycommands_fr.json file on 4.3 at some point, when switching languages?