i lost my mushroom farm

[RealAcarries_]

i had a mushroom farm which called "Acamushroom".the farm was close to spawn. i spent 18,000+ cobblestone building the mushroom farm,and it took me hours making it. it was the 2nd biggest mushroom farm on the server
however,the chunks where i built my mushroom farm was rollbacked,and the farm was gone
it happened when i was offline,so idk the exact time.(sept 8 -- sept 16) the coord of the farm was -46,122 (-3,7 chunk)
i hope if i can gwt my mushroom farm back.if i cant,then tell me why did my farm get removed.

[RealAcarries_]

i built a new 1 at the same location
and it looks better xd

[Julius]

bad looking / laggy farms will be removed if they rebuilded near spawn