Since Folia moves the connection tick to the beginning of the tick,
the player's position would be incorrectly updated by the move
packet and be used during the tick.
This would cause the player's bounding box to be incorrect, which
would cause incorrect movement collision calculations, such as
colliding with fire.
Fixes https://github.com/PaperMC/Folia/issues/119
It becomes invalid switching dimensions or by moving far. If
it used after teleporting, then it may also trip thread checks.
Fixes https://github.com/PaperMC/Folia/issues/94
Fix two regionizer issues:
In ThreadedRegionizer#addChunk, fix the incorrect handling
of merging two regions where one of the regions had
pending merges. If the first region had pending merges,
and the second was marked as "ready" then the merge would
cause a "ready" region to have pending merges. The fix is
to simply downgrade the "ready" region to "transient,"
as was previously done if the merge was delayed in the
case where the first region was "ticking."
Additionally, prevent the creation of empty regions
by checking if any new sections were created. This would
happen when a section existed, but had no marked chunks
in it AND all of the sections neighbours existed. In these
cases, no region needs to be created as no sections were
created.
