Ran into this two nights ago and last night. Playing cross-platform with my lady, we get to the very end of the Ritual, the last Threadweaver portal is a solid wall. She was fireteam lead, we switched to me being lead, reloaded checkpoint no dice. Completely restarted the mission from the beginning, again, no dice.
We tried to cheese it with sniper rifles and rocket launchers, to just kill the Threadweaver, but the web acts as a shield, it seems like. Even tried it from other towers, and they are of course so far apart I don't think even max mobility could float over there.
I cannot find anything online about this particular bug? Any help? Please see the above link for a 20 second video I recorded of the bug. :(
I'm on PS5 as well.
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sliding into the portal worked for me!