Can't enter voices with initial rests --- is this a bug?

I've had no end of trouble getting voices to behave correctly when one of the voices is supposed to have rests in it. I've spent the last two hours trying to enter a single, extremely simple measure. And yes, I've watched the videos and read the tutorials, and none of them seem to cover this problem.

So let me provide a minimal example. This image shows four notes and four rests:

My goal is to have those measures overlap, to be a single measure with two voices, two D's and two G's (or two F's and two B's, if you prefer bass clef). You can play this beat pattern on a piano without any difficulty at all. And you can certainly handwrite it.

Any attempts to enter this simple pattern in Musescore seem to fail pretty badly. If I enter the top voice first and then the bottom one, the quarter rest of the bottom voice seems to destroy the first beat of the top voice. If I enter the bottom voice first and then the top, the dotted-half swallows the eighth notes. Musescore seems to think these are one voice no matter how many times I type Ctrl+I, Ctrl+2.

So I'd like to ask if anyone out there can actually do this. It seems like it should be quite possible, but I've yet to find the magic incantation of keystrokes and mouse clicks to convince Musescore to allow it.