I created a world, closed it, and reopened it. Then, the game crashed.
Test world file:
[media]Stack trace
1.16-pre1\: [^crash-2020-06-04_21.30.34-client.txt]
Description: mouseClicked event handler
java.lang.IllegalStateException: Lock is no longer valid
at daa$a.i(SourceFile:297)
at daa$a.h(SourceFile:431)
at dtv.a(SourceFile:176)
at dlt.a(SourceFile:1850)
at dph.c(SourceFile:42)
at dne.b(SourceFile:33)
at dmy.a(SourceFile:16)
at dnc.a(SourceFile:149)
at doa.a(SourceFile:27)
at dlu.b(SourceFile:92)
at dqn.a(SourceFile:431)
at dlu.a(SourceFile:92)
at dlu.c(SourceFile:162)
at amk.execute(SourceFile:94)
at dlu.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.glfwWaitEventsTimeout(GLFW.java:3174)
at com.mojang.blaze3d.systems.RenderSystem.limitDisplayFPS(SourceFile:124)
at dlt.e(SourceFile:1038)
at dlt.d(SourceFile:648)
at net.minecraft.client.main.Main.main(SourceFile:215)
Duplicate of MC-187353