customSortButtonAttributes except wire:key

[marcheffels]

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Reproduce: Go to the Demo page and deselect the name or another column. It will looks like

I can't explain exactly why removing wire:key is the solution. I looked for the last changes of the file. At the commit setThSortButtonAttributes was the hardcoded classes replaced with customSortButtonAttributes and this work added wire:key to the button. Maybe this issue comes because the same wire:key is set on tow html tags (th and button).