Hey, ive got some really annoying fails during the generation of new chunks.
There are no tress, no tallgrass, now snow and no plants.
Im running Version git-Spigot-4af49dc-4e19de1 , ive tested it with no Plugins, a new world and only this setting in the server.prop file:
[SPOILER="Server.prop"]
server-name=Unknown Server
generator-settings=Dungeon Count\: 25
force-gamemode=false
allow-nether=true
gamemode=0
broadcast-console-to-ops=true
enable-query=false
player-idle-timeout=0
difficulty=1
spawn-monsters=true
op-permission-level=4
announce-player-achievements=true
pvp=true
snooper-enabled=true
level-type=DEFAULT
hardcore=false
enable-command-block=false
max-players=20
network-compression-threshold=256
resource-pack-sha1=
max-world-size=29999984
server-port=25565
debug=false
server-ip=
spawn-npcs=true
allow-flight=false
level-name=world
view-distance=10
resource-pack=
spawn-animals=true
white-list=false
generate-structures=true
max-build-height=256
online-mode=true
level-seed=-8913466909937400889
enable-rcon=false
motd=A Minecraft Server

[/SPOILER]
everything else is vanilla

Here's a picture of what happens:
http://www.bilder-upload.eu/upload/2a086c-1464302396.png

I cant find a fix for it yet and it happens everytime.
I think it happens much more often if i fly with gamemode 3 and the highest speed over new chunks.
Could someone pls help me with this problem? It ruins my hole world.