You DON'T have to live with this
I had the exact same issue pop up with my level 20. Dr Cheng gave me a Banished Pantheon mission in Dark Astoria. I logged a bug with support and while in game, a GM took some infomation and then set the mission to complete, giving me 230 experience etc.
I missed out of course on the XP from killing the 20 Banished Pantheon, but then I also got a slot free to get another mission. The GM said to please log support calls while *in game* for this - because it is NOT supposed to happen
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At least one level 20ish contact in Independence Port will give out a "Defeat 30 Sky Raiders in Terra Volta" mission to you even if you're
three levels below the minimum security level (23) to enter Terra Volta. I had to spend three long, long levels staring at that mission on my list.
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