If you queue as both prot and dps it will never let the prot queue pop, it cancels the prot and you only queue as dps. I’ve tested this multiple times where there’s another prot pally in the queue. When I only queue as prot it’s instant and I don’t accept. Then I queue as prot + dps and the prot lobby doesn’t pop. So I cancel and only queue as prot and it instantly pops.
Queueing as dps and prot at the same time somehow removes paladin from the prot queue. This is a major bug.