Confirm. I’ve got this when I completed Tier 5 when I have Exploratory Sequencing tasks duplicated (but not completed). After this pressing “Get Reward” button The Agency window got stuck and the event disappeared after the client restart.
This is ‘per account’ bug because I still have event on the other accounts but I don’t have it on the other characters on this acc.
May be this helps.
P.S. This bug appeared only after this downtime. Before it everything was OK.