Trying to load an old world from 1.8.  I've tried the "optimize world" option (which seems to have worked), but when attempting to load the world it crashes around 96%.

-I've tried restarting of course

-Uninstalling and reinstalling

-Uninstalling Java and reinstalling

-I am able to successfully reload other 1.8 saves I have, just not this one for some reason.

-It was at one point a Realms save if that makes a difference.

---- Minecraft Crash Report -------- Minecraft Crash Report ----// I let you down. Sorry
Time: 8/17/18 2:08 PMDescription: Ticking memory connection
i: Non [a-z0-9/._-] character in path of location: minecraft:EntityHorse at pc.<init>(SourceFile:38) at pc.<init>(SourceFile:43) at wn.a(SourceFile:121) at wn.a(SourceFile:100) at wn.<init>(SourceFile:48) at vo.a(SourceFile:915) at te.<init>(SourceFile:159) at vo.g(SourceFile:442) at ud.b(SourceFile:113) at ud.Y_(SourceFile:65) at hw.a(SourceFile:238) at ua.c(SourceFile:171) at net.minecraft.server.MinecraftServer.w(SourceFile:749) at net.minecraft.server.MinecraftServer.v(SourceFile:656) at dfx.v(SourceFile:157) at net.minecraft.server.MinecraftServer.run(SourceFile:559) at java.lang.Thread.run(Thread.java:745)

A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
– Head --Thread: Server threadStacktrace: at pc.<init>(SourceFile:38) at pc.<init>(SourceFile:43) at wn.a(SourceFile:121) at wn.a(SourceFile:100) at wn.<init>(SourceFile:48) at vo.a(SourceFile:915) at te.<init>(SourceFile:159) at vo.g(SourceFile:442) at ud.b(SourceFile:113) at ud.Y_(SourceFile:65) at hw.a(SourceFile:238)
– Ticking connection --Details: Connection: hw@dbd170fStacktrace: at ua.c(SourceFile:171) at net.minecraft.server.MinecraftServer.w(SourceFile:749) at net.minecraft.server.MinecraftServer.v(SourceFile:656) at dfx.v(SourceFile:157) at net.minecraft.server.MinecraftServer.run(SourceFile:559) at java.lang.Thread.run(Thread.java:745)
– System Details --Details: Minecraft Version: 1.13 Operating System: Windows 10 (amd64) version 10.0 Java Version: 1.8.0_51, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 287742448 bytes (274 MB) / 570425344 bytes (544 MB) up to 1073741824 bytes (1024 MB) JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M Profiler Position: N/A (disabled) Player Count: 0 / 8; [] Data Packs: vanilla Type: Integrated Server (map_client.txt) Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.