Server crash while loading Superflat world based on Rails // java.lang.StackOverflowError: Exception while updating neighbours

Encountered an unexpected exception
z: Exception while updating neighbours
	at net.minecraft.server.MinecraftServer.b(SourceFile:886)
	at net.minecraft.server.MinecraftServer.a(SourceFile:822)
	at faq.a(SourceFile:96)
	at net.minecraft.server.MinecraftServer.x(SourceFile:688)
	at net.minecraft.server.MinecraftServer.a(SourceFile:270)
	at java.base/java.lang.Thread.run(Thread.java:831)
Caused by: java.lang.StackOverflowError
	at java.base/java.lang.ClassLoader.defineClass1(Native Method)
	at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1010)
	at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150)
	at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:855)
	at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:753)
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:676)
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:634)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:182)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519)
	at bwq.a(SourceFile:361)
[...]