I do not know the reason all that happens is a crash and
The game crashed whilst unexpected error
Error: java.lang.NullPointerException: Cannot invoke "net.minecraft.client.renderer.ShaderInstance.m_173350_(String, Object)" because "$$13" is null
Exit Code: -1

I am not running shaders

the crashing is specifically replicated by holdign a Xnet item (cable or connector) in your hand and pressing shift

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Same for me, plus it crashes with the same error message when I try to highlight a block via the controller.
Also, the game just crashed on me while I was trying to delete a channel in the controller. The error message is:

The game crashed whilst mousereleased event handler
Error: java.lang.UnsupportedOperationException: Attempted to call Event#setCanceled() on a non-cancelable event of type: 
net.minecraftforge.client.event.ScreenEvent.MouseReleasedEvent.Post
Exit-Code: -1