When I open my old world in 1.13.2 it crashes after ca. 0.5 seconds.
18w43c: [^crash-2018-10-26_17.32.21-server.txt]
Description: Ticking block entity
java.lang.IllegalArgumentException: Cannot get property bmy{name=enabled, clazz=class java.lang.Boolean, values=[true, false]} as it does not exist in Block{minecraft:netherrack}
at blx.c(SourceFile:95)
at bkt.a(SourceFile:138)
at bkt.Z_(SourceFile:129)
at aza.n_(SourceFile:1060)
at tz.n_(SourceFile:293)
at net.minecraft.server.MinecraftServer.b(SourceFile:738)
at net.minecraft.server.MinecraftServer.a(SourceFile:664)
at djq.a(SourceFile:125)
at net.minecraft.server.MinecraftServer.run(SourceFile:568)
at java.lang.Thread.run(Unknown Source)
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I have also been having this issue. I originally posted it as MC-134542 but that was marked as a duplicate of MC-135453, which was then marked as fixed. I am still having the issue however.
Crash report attached, but my world file is too large, so is linked below.
[media]Edit: dropbox link to world file
Please let me know when I can remove the world file, as I have limited space available.

Attached crash reports by @unknown, which were originally attached to MC-135453.

Attached @unknown's world (comment with most of the files which are not hopefully needed stripped out.
World:
Crash report:
Additionally the warning "Block Entity was expected to be a chest" was logged. @@unknown, did you see this warning as well? And could you please still leave the world in your dropbox for now.

I do also see the expected chest warning (x7), (I had assumed they would be in the crash report.)
Also, I can leave the world file there as long as it's actually useful, just please let me know when it's no longer needed.

Still affects 18w49a btw

Is this still an issue in 19w11b?

I tried again in 19w11b and the game still crashes. But this time I get ticking world crash. (New crashlog provided) As a workaround i can restart the game, and try again and the game will not crash in that area. It will still crash if i move towards my base ie.
The game feels in general very laggy (speed of chunkloading, elytra deployment)
I did not use the optimize world option before playing.

Ok, so let's try to unwind this:
Initial issue matches something we fixed few snapshots ago
Most recent snapshot is probably MC-134762, this may be fixed in next snapshot, but we will observe crash logs for some time before closing
Attached world is bit of a lost case, since it seems to be already corrupted - some chests have hopper data (like one at x:-281,y:30,z:-1233). In 1.12, they won't clicked when opened in survival and creative and open hopper menu in spectator. I suggest manually breaking and replacing those chests before importing. Anyway, whatever caused that is not part of this issue, since world was already corrupted in 1.12.1.

Yes it is getting better. I attached a new crashlog made in 1.14pre1.
Note that it crashes once and then that area is good. (may crash in other areas)

As said, seems like it morphed into MC-134762 duplicate, I don't see point in keeping this open.
Could you please attach the 1.12 world or upload it somewhere and share the link? If you are uncomfortable with publicly sharing it, you can first change the "Security Level" of this report to "private".