I dont know whether this is a feature of the event or a bug, but sometimes the turrets that are needed to remove the slime from the vine dont fire properly and do no damage or slime reduction at all.
I then just usually get another one and use it instead and the 2nd one usually works.
But this morning, every turret I used didnt work.
When they dont work, instead of a bright orange flash, all that happens is a very dim orange flash but no slime gets removed.
Been happening for many months , but is random and most of the time they do work properly.