This can happen when a light source is removed and later encountering another light source to fill the gap. A higher light level may get set and then not propagated. This bug is difficult to explain, but fairly easy to reproduce.
Grass can cause issues here by requesting blocks randomly offset away from itself, which can cause silent chunk loading on chunk ticking. It also causes crashes if chunk autoloading is taken away, which is obviously undesired.
It was also noticed that player chunkloaders cause chunks to start getting ticked as soon as they load their first chunk, which is before the entity is visible to everyone else on the server. This is probably undesired behaviour.
this can happen when eval() is used, and then we get a big blank mess with nothing on it. eval() is a special case that should be handled separately, but for now this is just fixing a bug.
This was observed in a recent crashdump where a plugin triggered a recursion error, but the stack trace did not contain any sign of a recursive event call. I conclude that this must have been caused by previous event handlers triggering errors 50 times in order to make the recursion detection break, because the recursion detection did not decrement the counter in cases where an exception was thrown.
This will be needed to deal with things like chest/furnace which don't use 0 as a valid state (these both use facing horizontal for rotation, and vertical is invalid, so 0 would mean downwards facing which is invalid.
The client likes to fall involuntarily as soon as PLAYER_SPAWN PlayStatus is sent, which causes debug spam on the PM side and then movement reversions if falling far enough. This now prevents the client moving until the server knows the client has spawned.
These methods:
a) add concrete dependencies
b) are pointless (event->getEntity() instanceof Creature, anyone? an IDE can better understand this as well...)
c) encourage bad code (they don't enforce type contracts the same way an instanceof check does - oh, and why not let's add an is*() for every new mob that gets added ever?
