Bug: iris regen messing with the trees

[svdgoor]

running /iris regen again fixes this, but it shouldn't happen the first time.
(Only happens when running /iris regen with a size; without a size it doesn't show this behaviour and performs like expected.

[cyberpwnn]

This is because of the parallax layer having issues updating it's cache

[svdgoor]

Regen disabled still, will re-open when issue returns after reintroduction