Temporary Assembly multipliers are not accurate.

When using a temporary assembly, if you enter a quantity less than that of the originally taken off temp assembly, you may end up with some items zeroed out. This is because Temporary Assemblies remember item quantities via multiplier, not the original formula.

To alleviate this, before creating the temp assembly, create a comment with the preferred assembly title and a quantity of 1. Include it as the first item in the temp assembly. This will force the software to bounce all of the math off of 1 instead of whatever it was to begin with.