Wierd arrow ball that crashes the game -can it be removed?

[Banksia Slayer]

I've found a chunk that causes crashes the server when loaded, and I think I've discovered why. In the screenshot I've attached, you can see what looks like an infinite ball of arrows up in the tree ahead, it's shedding a few. Not  sure how it got there, but it's causes major problems.

Is it possible to reset that chunk or something? I'm basically locked out of the server now, as logging in again loads that chunk. You can see my coordinates in the attached screenshot. I assume the arrow ball wasn't naturally generated.

PS, there are a lot of force-loaded chunks piling up from players who haven't been active for a long time. Is there a way you  can reset that force-loading, so these zombie chunks aren't wasting server memory?