Recently upgraded to Photoshop 23.4.2 (for Windows), and when making an animated GIF, in the "Save for Web" GIF dialog, the GIF preview will not play. You may manually cycle through the frames, however it will not play with the play button.
It does appear to still create the GIF after the "save" routine. There is just no preview. You must save, open externally, re-render, check externally again... etc.
If you have the knowledge to fix this, that would be great.