The dome just stays closed for the rest of the timer even though it's at 100%. Offerings used after the glitched round do the same thing and the boss doesn't spawn.
I've only notice it glitch like that when an Enhanced Captain offering is used. I don't know if it's just a coincidence or if it's specifically because of Enhanced Captain.
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Hello, Thanks for reporting this bug. I have experienced this issue once personally, and I wish I had been more diligent with reporting. That said, the current workaround regarding this issue is to simply return to Orbit with your entire fireteam and then travel back to the Plaguelands from there. Best. Schnemley