I been receiving crash reports upon joining the server regards to the Changed Mod.

Here the Report
File below
Crash Report (Whitelatex).txt

Upon joining the Server. you will be falling to void (entire server. aka tps has frozen in time)
10 - 20 seconds later. the entire server crashes. Watchdog has proceed to kill the server

Disabling watchdog fixes but there still lag spikes that are caused by the mod.

It seems that the issue is actually caused by MrCrayfish's Furniture Mod. Mainly the post office block.

Error seems to be from either crayfish's funiture, or some sort of optimization mod. Crash summarized:

Minecraft posts a world tick event ->
Post office from mrcrayfish's furniture ticks ->
tries to get a block entity ->
tries to read chunk from cache (doesn't find it) ->
a modded function called getChunkBlocking calls minecraft's blockable event loop (halts execution until tasks are complete) ->
Minecraft waits for a non-existant (or unending) tasks ->
hang watchdog sees this world tick take 1 minute (too long) ->

CRASH