Unwanted chord symbol movement

3.2.3.7635

I am working on a piece - the drum/bass part at times needs 2 voices.

I had entered the 2 voices but I wanted to switch the voices in a bar that contained a chordname.

I selected the bar and "switched" the voices using the ideogram.

The voices switched properly but the chordname switched from above the staff to below the staff.

Removing auto placement did not fix this.

EDIT: I have discovered that the Rehearsal mark is also move. I suspect that this will apply to more symbols.