[fixed] Collapsing Faces yields weird results

[micheus]

ptoing, thanks for report that.
I repeat your process and got a slight different resulta, but still the unwanted one.

I don't remember to use this option. Usually I do that for edges. It looks that no many people uses it as well.

As an option to "fix" that apply dissolve command to the faces first (DEL or BACK-SPACE) and then collapse them.