Tremolos overlap with notes and have wrong angles

Good evening!
To reproduce this bug, in a 4/4 score, add a 32nd tremolo (triple beams) between two halves (E1-E2). The beams will actually cross the notes. The angle looks wrong (the beginning of the tremolo beam should be lower; maybe even closer to the left. This happens in the presence of other voices, too. The shorter the duration, the worse it gets: 32nd beams between two quarters look uglier, the ones between quavers are so far the ugliest.

P.S. Sometimes, when I select a bar in a staff in a multi-staff score, the selection goes up to infinity, but not the measure that I have selected (looks inverted). Almost like in Martin’s quote: ‘The beams can stretch—they can stretch really high’.