Solidworks 2018 SP4.0 Saving an Assembly

Recently when I try to save some assemblies, without prompting me, it tries to save every part (even though they are read-only).

This means that I have to hit cancel on the save prompt >50 times. I want to save the assembly only. I have the “do not save read only files” checked.

Is this a bug?

SolidworksGeneral