when flag placed file broke

[ylandy 0]

i was playing ylands for a good 3 hour run and then when i placed a flag on my ship the game froze (oh and also ground is easily able to fall through if stepped under falling trees or jumping of high areas sometimes) and after i loaded the world and when i got close or even looked at the ship the game just freezes :( please help

[ylandy 0]

Large boat and sail btw

[ylandy 0]

it happened again 4 times when i went near this certain area on a large boat i put a brazier and bed and ship helm when ever i went near it the game froze gave 1 fps for a second then crashed