I have figured out what causes this black screen glitch on baboon or anteater reconnect, this can happen on any story, raid, or strike that have "Joining allies" active.
https://youtu.be/xOmMTjtBC6k
It appears that if it takes more then 8 seconds to reconnect, black screen may results. This also happens every time when reconnecting in a middle of "joining allies" countdown. I have tested this with my router that can manually disconnect a TCP connection, and this happens every time when "Joining allies" countdown showed up just before reconnecting.. I did happen to get this black screen problem on reconnect yesterday on a new strike when my internet had a connection problem.
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Here comes the black screen again, this time on nightfall, The abomination heist. https://youtu.be/zMc5zar-uYw?t=2h32m46s My connection had a little problem and reconnected to a BLACK SCREEN with working audio with me actually being able to fire at the black screen. Opening gears/inventory works, it just won't show anything when out of this menus. The old original level 10 strike "The summoning pits" never have this black screen problem on reconnect, probably because there is no "Joining allies" areas at all. The remade strike "The abomination heist" have joining allies areas when doors closed, and with it, the black screen problem on reconnect. What good does a reconnect do if all I can do is hopelessly fire at the BLACK SCREEN and hold triangle to return to orbit. Reconnect is nice, if only it wasn't for this black screen problem.