As title says, the serious bug that is merchants disappearing from Black Markets has returned, albeit under a different form. The theory I have is if you destroy one GPS station whilst it is cloaking the market, if you build another they possibly disappear and they stop supplying money. Bounties still work, as expected. I am not 100% sure but all that attacked my Black Market was the firestorm GP and Msta bombardment. They didn't kill the merchants from what I saw.
I have uploaded the replay for easier checking but you will need to install the RGO patch and install the 'Hostile Lawn' map which is on this very forum too, in order to view the replay.
Note: This bug does happen in regular 1.86 ROTR as well.