Violone has incorrect short instrument name
MuseScore's "Violone" instrument has the short instrument name "D Vne.". It should just be "Vne."
There is a separate "D Violone" instrument that is correctly abbreviated to "D Vne.". The violone is a stringed instrument similar to a cello, and the "D" refers to the pitch of the lowest string.
Note: According to the string data (Right click > Staff Properties > Edit String Data), MuseScore's generic "Violone" instrument is actually a "G Violone", though it is useful to have a generic violone instrument with unspecified tuning.