I have Loaders from Krastorio in the 4th column, but Hot Swap will not swap to them. Also I put in a burner inserter in the 4th column and it seems to ignore that too.
I found a bug that MIGHT be what you're talking about? Give the latest release a try. It may be that you need to delete the filter row and add a new one for it to fully take effect but it should be good now