As you know, I use MuseScore 3.0.1 into UbuntuStudio 18.04.1 LTS (64 bit Linux).
I wonder if this is a bug, and/or a regressions...
The fact is when we are editting the Staff/Part characteristics, and we want to change text... We can not to use international characters directly from the PC keyboard (for example: any character with written accent). If we use an [a] + ['] keys combination, of course expecting to get this... "á", we just get a simple "a" character.
It is the same with the lyrics, but... Here, we can use the additional characters palette to workaround it.
It was not this way with MuseScore 2.3.2. So... I think something was missing in the upgrading process.
Whatever... Why MuseScore doesn't recognize these keyboard combinations, directly, as any other app???
Blessings and Greetings from Chile!!!