I sorta didn't come in for a long time, so today was the first time I've seen the bug-catching. Thought it was a quest, with the usual "Buy-submit" policy. So, I bought a banana slug/bug, but the page of "thanks, nice bug" had the actual catch-able bug on the page. I clicked to catch it, but got Pick up item

Oh No! Invalid Item - 188810!

Presumably, because the quest had already closed, seeing as I've submitted a caught bug. However, it's a bit sad to have caught nothing and just see an error (and on my last and only day of bug-catching). And the error doesn't look very neat lore-wise.

Maybe you could not destroy the item's chances of popping up being collected, really, the moment the quest closes?