Two-note tremolos display incorrectly when the stave has custom scale
1) Enter a two-note tremolo with the duration of a half note (or a dotted half note) using Musescore 3.5.
2) Change the tremolo stroke style into "All strokes attached to stems" (using the Inspector).
3) Change the size of the both notes (using the Inspector - Chord - Small), or change the scaling of the stave (Using right-click).
The stroke will not be attached well to the stems anymore as long as the stave scaling and/or notes size changes. As shown in the screenshot below or the attached score file.