James Madrox

Confirmed 18w07b:

[22:00:49] [Client thread/ERROR]: Couldn't render entity
java.lang.ClassCastException: java.util.Optional cannot be cast to java.lang.Boolean
at ajs.dA(SourceFile:140) ~[18w07b.jar:?]
at cgw.a(SourceFile:24) ~[18w07b.jar:?]
at cpo.a(SourceFile:142) [18w07b.jar:?]
at cpt.a(SourceFile:41) [18w07b.jar:?]
at cpt.a(SourceFile:16) [18w07b.jar:?]
at cot.a(SourceFile:368) [18w07b.jar:?]
at cot.a(SourceFile:355) [18w07b.jar:?]
at ckj.a(SourceFile:612) [18w07b.jar:?]
at ckd.b(SourceFile:1175) [18w07b.jar:?]
at ckd.a(SourceFile:1083) [18w07b.jar:?]
at ckd.a(SourceFile:944) [18w07b.jar:?]
at bxe.b(SourceFile:820) [18w07b.jar:?]
at bxe.a(SourceFile:381) [18w07b.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:141) [18w07b.jar:?]

Looks to be similar to the bug that was fixed in 18w02, though I didnt see that when typing in "Zombie Horse Invisible" for anything recent. The log data seems to indicate a rendering issue:

[22:00:49] [Client thread/ERROR]: Couldn't render entity
java.lang.ClassCastException: java.util.Optional cannot be cast to java.lang.Boolean
at ajs.dA(SourceFile:140) ~[18w07b.jar:?]
at cgw.a(SourceFile:24) ~[18w07b.jar:?]
at cpo.a(SourceFile:142) [18w07b.jar:?]
at cpt.a(SourceFile:41) [18w07b.jar:?]
at cpt.a(SourceFile:16) [18w07b.jar:?]
at cot.a(SourceFile:368) [18w07b.jar:?]
at cot.a(SourceFile:355) [18w07b.jar:?]
at ckj.a(SourceFile:612) [18w07b.jar:?]
at ckd.b(SourceFile:1175) [18w07b.jar:?]
at ckd.a(SourceFile:1083) [18w07b.jar:?]
at ckd.a(SourceFile:944) [18w07b.jar:?]
at bxe.b(SourceFile:820) [18w07b.jar:?]
at bxe.a(SourceFile:381) [18w07b.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:141) [18w07b.jar:?]

confirmed 18w07b on a map I exited with crafting table open.
here is the log portion of the crash:

"[17:05:08] [Client thread/FATAL]: Unreported exception thrown!
java.lang.ClassCastException: cby$b cannot be cast to amn
at cda.a(SourceFile:39) ~[18w07b.jar:?]
at ccy.f(SourceFile:84) ~[18w07b.jar:?]
at ccy.a(SourceFile:73) ~[18w07b.jar:?]
at ccx.c(SourceFile:186) ~[18w07b.jar:?]
at ccx.a(SourceFile:114) ~[18w07b.jar:?]
at ccx.a(SourceFile:78) ~[18w07b.jar:?]
at ccg.c(SourceFile:56) ~[18w07b.jar:?]
at cau.a(SourceFile:310) ~[18w07b.jar:?]
at bxe.a(SourceFile:728) ~[18w07b.jar:?]
at bxe.av(SourceFile:1335) ~[18w07b.jar:?]
at bxe.m(SourceFile:1220) ~[18w07b.jar:?]
at bxe.b(SourceFile:791) ~[18w07b.jar:?]
at bxe.a(SourceFile:381) [18w07b.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:141) [18w07b.jar:?]
[17:05:08] [Server thread/INFO]: Saving chunks for level 'Water Snapshot 2'/the_nether
[17:05:08] [Server thread/INFO]: Saving chunks for level 'Water Snapshot 2'/the_end"

Confirmed 18w07b

Also, the blocks are solid and remain that unless broken by hand or the machine is turned back on. If the machine is turned on they disappear until you stop it, and it bugs out again. It is not something that happens every single time, but about every 5th-6th switch.

Oddly it allowed me to attach the screen captures after I posted..

Apologies, Not one to usually report bugs. Generally I will fix any major bugs that bother me enough via source mods to the decompiled code. However I'm just getting back into Minecraft again after a 4 month leave. Therefore, I haven't really had a chance to dig into the new source code. This bug just erk'd me a little building a house so I figured I would take the easy route and report it right to you guys instead of decompiling and looking into it myself. However I would like to say awesome job so far guys. These recent updates are bringing me back into Minecraft with a new outlook on things to do.