Hi,
I've noticed on your J4 demo site that GPSTools, Track and Catagogy would generate some (invalid) alias foreign characters.
Ex : Title = Balade à vélo (vcmb) > Alias: "balade-à-vélo"
rather than "balade-a-velo" alphanumeric only characters.
Other extension and Joomla Menu don't.
Is-it normal, Joomla or Gpstools ?
BR, Gil