Layers not preserving order when 'Sending to back'

Let me know if this is in the wrong place.

I’ve got two layers- an image and a background. I want them both to be under a third layer.

Right now the layer order is flipped so the background goes in front of the image when sending both to back (not in group). Very annoying!

Used to behave as you’d expect with layer order preserved.

This is a bug in a recent update I’m assuming? Please fix!