Clef change at beginning of system does not display correctly when in a multibar rest

Take the following sample score for a bassoon - default clef is bass.
clef-multibar.mscz

Note 3 bars rest at the beginning. Now change the clef to tenor for the entire score. The change is good. Now turn on multi-bar rests (M) and the original default clef shows at the beginning of the system - but the notes are in tenor-clef position.

In screen-shots this is what we see:

change to tenor clef

switch on multi-bar rests (note that the note positions following the apparent bass clef are for tenor clef