feedback on full vault issue

So not a bug per say, but feedback on an issue I am having with my vault. 

I just failed a run, and so it auto equipped me with sponsor kit I had in my vault, the issue is that I also completed a contract and got a bunch of items.  Now it will not let me start a run because I have a single item of overflow, but I also cannot equip an actual set (instead of the sponsor kit) to make room in my vault for the overflow.  I will just sell something to work around it, but this seems like a silly frustration for no real need.