6 linking Bug

I was just playing standard and I was 6 linking an item, and tried to use a fusing after it was 6 linked, which broke the 6 link. I think this is not intended, as it was not happening before. The difference is I was using the mid slot of the currency tab this time, might have something to do with it. Thanks and regards.

Some items look like they have 6 links when they don't just because of the artwork. I don't think it's possible to use a fusing on a 6L item. Or a max linked 5 socket item.

i just test it on an 5 linked.
i got the message: item already has the maximum number of Socket links