Samuel Klumpers

Sorry, I think this is an invalid issue,
as you probably can't supply us with proper information.

Not that it's relevant, but please update your Java to 8.45.

Invalid.
"Plzz" update your Java to 8.45

Could you attach the log in the "Game Output" tab on the console?
To be able to do that, go to "Edit profile" and tick "Launcher visibility" and select "keep the launcher open".

Thank you.

Could you attach console output?

Intended, donkeys can't wear armour.

From the launcher menu, when the game is already loaded, go to the tab "Game Output".
After reproducing the bug, copy paste the whole log that has generated there to a plain text file and attach that to this post.

Do other versions work?
If not the problems lie in the launcher.

Searched the code, of course it's impossible to read, but I think you (or Minecraft) are (or was) out of memory

[16:57:28] [Client thread/ERROR]: Item entity 496060 has no item?!

The big number makes me worried, maybe your world is overloaded with a extreme amount of entities.

The last one (Java 8 update 45)

There's a corrupt item entity in your world, but I don't know whether that's the cause.
And also, what were you trying?

Try reinstalling, it's very likely, it's your system.
Also check your Java, really that's the first thing I do before reporting anything.

I think this is more of a feature suggestion or opinion than an issue, is it?

It's Java having issues here, not Minecraft.
Java allows Strings up to a size of 32768 bytes and no more.
If this really is a problem to you, report it to Oracle.

Try making a Java class and set the value of a string to a length of >32768 to demonstrate, it won't compile even.

This has been in the game for a long time and is probably a duplicate of some other issue.
And also, why would you even want to have an entity up so high?

Could you please attach the console output?

In other words, there's no check being executed whether the player is placing the block on itself in contrast to other blocks.

MC-80974 is the expression of this issue, the armorstands are placed with arm and leg poses of 0 and therefore are removed as is described here.

That's funny, I think that means the world persists in your RAM after the hardcore world death.
Could you attach console output?