Clicking wrong tremolo type and undoing corrupts beat count

Version 1.1 revision 4611 on Windows Vista

How to reproduce: create a score (any time signature/key signature/no. of instruments) and put quarter, eighth, sixteenth, etc. notes on the score, and then put a whole note tremolo (tremolo without stem) on all the notes and then undo. 32th, 64th, and 128th notes will appear. Half notes aren't affected for some reason. You have to delete the whole measure (which is annoying if you're creating multiple staves) to fix the problem.