having spoken to mojang about this the general issue is data which shouldn't
have been saved in the first place, so if we lose this data it's not really
an issue, bar being annoying spammy. if the spam gets on your nerves, shamefully,
all you can really do is forceUpgrade to get the conversions of the way.
Dropping as this breaks other aspects of the server and bar being spammy
seems to have no other real negative outcomes
Upstream forgot to update the check here which prevents explosions
occuring under 0 height, however, vanilla already checks that we
are in bounds of the world above this, so this call is entirely
redundant.
Jake Potrebic
Shane Freeder