Matthew Strelsky

I just checked it with the latest launcher on Linux and Java 17. This issues still exists. Please reopen.

I can confirm that I am also having this issue today, Sat Oct 9th, 2021. When trying to launch Minecraft when using the java-17-openjdk-amd64 on Ubuntu it fails to start giving the following error.

Your Java Runtime is incompatible. Please edit your installation to use the bundled Java Runtime.
Name: Java version mismatch
URL: http://aka.ms/jnierror

Reverting to java-16-openjdk-amd64 via the update-alternatives command fixes the issue. However this is only a workaround. Newer versions of Java should ALWAYS be supported. Especially in this case since Java 17 is a Long Term Support release.

Without sharing the error log there's no way to determine what the issue is. However it it unlikely that it is an issue on Mojang's end. 

Ensure you have the latest version of Java on your system (JRE 16) and that your OpenGL driver's support OpenGL 3.2. Granted those are only guesses for solutions to your problem without the logs.

Regardless this isn't an issue for Mojang.

I can confirm this happens to me as well, but it also happens  in 1.16.5. When left clicking an item that is in an itemframe, and the item frame is placed on the bottom of the block, the item tends to get stuck on top of the block.

This means that if you placed an itemframe on the ceiling of a room on your house and left clicked an item out of it, you would have to go all the way outside your house and get on top of the roof to get your item back.