Incorrect Treble Recorder range
Treble recorder (Alto recorder) listed in 'Choose instrument(s)' under 'All music' or 'Early music' outputs a wrong Professional range of "E4-C7". The correct range is F4-G6 or even better F4-A6, but in no way the one provided in musescore.
Trying to find a workaround to the problem I tried modifying the Treble Recorder definition in the \MuseScore 3\instruments\instruments.xml file but the change I made had no effect on what is output for the 'Stave/Part Properties' (I also tried changing the name from 'Treble' to 'Alto', which I prefer more).
Having faced with the problem I also realized it would be great to actually be able to modify the instruments lists and data (the way I originally thought I could change in the above mentioned file).
And yet another great thing to have in the 'Choose instruments' list would be to have a 'Favourite Instruments' list. Some instruments lists are very long and finding your instrument is not easy.