Portamento doesn't play as expected in certain cases
When using glissando on the flute with Play style enabled as portamento in the Inspector panel you get a discrete scale by quarter tones instead of a bending sound. Besides, at the end there is a parasitic beep sound at the nominal pitch of the first note.
In the attachment there are two examples. In the first one, the problem with the glissando is shown, In the second one, how it should sound. For the latter I've used the guitar bend, In both examples the playing effect has been made invisible and the bending (non-playable) sign has been used as visible notation.
Suggestion: the guitar bending engine could be used in the portamento version of the glissando adapting the initial and finel pitch.