The game crashes when you shift-click on a chest while you are looking at a donkey's inventory and while a command block removes the chest from a donkey.
To reproduce
- Summon and tame a donkey
- Put a chest onto the donkey
- Run
/data modify entity @e[type=minecraft:donkey,limit=1,sort=nearest] ChestedHorse set value 0b
in a command block in order to remove the chest from the donkey.
4. Set the command block to Repeat, Unconditional, and Always Active
5. Fill your inventory completely
6. Open the donkey's inventory
7. Shift-click on any item
→ 
The game crashes
Stack trace
20w46a: crash-2020-11-25_14.32.08-client.txt
Description: Container click
java.lang.IndexOutOfBoundsException: Index 44 out of bounds for length 38
at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:248)
at java.base/java.util.Objects.checkIndex(Objects.java:373)
at java.base/java.util.ArrayList.get(ArrayList.java:427)
at gj.get(SourceFile:46)
at bis.a(SourceFile:528)
at bjp.b(SourceFile:108)
at bis.b(SourceFile:267)
at bis.a(SourceFile:172)
at eaz.a(SourceFile:396)
at dsz.a(SourceFile:562)
at dsz.a(SourceFile:358)
at dnj.b(SourceFile:92)
at dsc.a(SourceFile:456)
at dnj.a(SourceFile:92)
at dnj.c(SourceFile:162)
at aol.execute(SourceFile:94)
at dnj.b(SourceFile:162)
at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36)
at org.lwjgl.system.JNI.invokeV(Native Method)
at org.lwjgl.glfw.GLFW.glfwPollEvents(GLFW.java:3101)
at com.mojang.blaze3d.systems.RenderSystem.flipFrame(SourceFile:115)
at dig.e(SourceFile:308)
at dni.e(SourceFile:1073)
at dni.e(SourceFile:688)
at net.minecraft.client.main.Main.main(SourceFile:215)
