Basicly loading a old world to new snapshot delete chunks, causing then to have to regenerate again. Seems to have effect on chunks with entities and tile entities used to be in there.
Linked issues
is duplicated by 10
MC-85840
When you do pretty much anything in either server console or chat on minecraft, it "soft crashes" you
Resolved
MC-85845
Server Errors when Teleporting.
Resolved
MC-85849
CRASH - Sending messages
Resolved
MC-85859
Command Blocks Gone
Resolved
MC-85871
Command blocks crash the game in 15w33a
Resolved
5 more links
One method to reproduce what I think is this bug:
Create a new world,
Place a command block
Enter the following command:
/give @p minecraft:tipped_arrow 1 0 {CustomPotionEffects:[
{Id:8,Amplifier:0,Duration:3600}
]}
Power it
Close and reopen world
Chunk containing command block will regenerate
I've tried it with a few other commands with no reversion, not sure what's special about this one
Powering it does seem to be important
Important note: This bug exists with or without upgrading from a previous version, contrary to the title