The mod core did not respond, causing the server to crash

[BH0721]

Log：Transport Simulation Core not responding; stopping Minecraft server

MOD：MTR 4.0 B8

Full Log：

[18:58:21] [Server thread/ERROR]: Transport Simulation Core not responding; stopping Minecraft server!
[18:58:21] [Server thread/INFO]: Stopping...
[18:58:21] [Server thread/INFO]: Stopped ServerConnector@3fe55197{HTTP/1.1, (http/1.1)}{0.0.0.0:8888}
[18:58:21] [Server thread/INFO]: Stopped o.m.l.o.e.j.s.ServletContextHandler@3a90d142{/,null,STOPPED}
[18:58:21] [Server thread/INFO]: Starting full save...
[18:58:21] [Server thread/INFO]: - Changed sidings: 4
[18:58:21] [Server thread/INFO]: - Changed depots: 5
[18:58:21] [Server thread/INFO]: Save complete for minecraft/overworld in 0.077 second(s)
[18:58:21] [Server thread/INFO]: Save complete for minecraft/the_nether in 0.001 second(s)
[18:58:21] [Server thread/INFO]: Save complete for minecraft/the_end in 0.001 second(s)

I cannot understand why this error occurred, so I can only provide corresponding logs to contribute to resolving it. I think it's normal for there to be bugs in the beta version, but I still hope the author can fix it in b9 or the official version