Ties don't work with overdriven electric guitar.
When I use ties on two notes in electric guitar, the notes play as if they had no ties, this doesn't happen with other instruments (at least not the ones used by the song I'm working on).
The weirdest thing is that sometimes it actually works.
I'm using version 4.0.2.
See #344207: A tie won't play and https://github.com/musescore/MuseScore/issues/16968
In reply to See #344207: A tie won't play by Jojo-Schmitz