I suspect this comes from Digero's move to rename the instruments, and adding 'basic' as prefix. But if you only get it from my upgraded version vs. Meastro 2.5.0, then I don't understand. (unless the name/band of your song contains the word "drum").
Which version of songbook are you using? There is at least 3 public available ones:
Songbook:
https://www.lotrointerface.com/downl...-Songbook.html
Songbook - The Badger Chapter:
https://www.linawillow.org/home/plugins-2/songbook/
Songbook Legendary edition:
https://www.lotrointerface.com/downl...ryEdition.html
I personally use the badger chapter with some modifications, so I don't have your issues and cannot check it.
Maybe try upgrade to Lina's The Badger Chapter songbook, it handles it a bit better than the basic songbook if I remember correct.
The badger chapter was made before fiddles and bassoons I believe, so it probably don't do it right for all instruments though.
I haven't tried the legendary edition but maybe it handles it even better yet.
Not sure if there are any other versions of songbook floating around.
Also be mindful of the "Pattern for ABC Part Name" inside Maestro options, to be sure that the instrument name is output in the part name.