repro: https://playground.babylonjs.com/#TMHF80#950
PG is adapted from the doc. Seeing aggressive flickering on the renderOverlay with billboard active in Chrome and firefox. Commenting out the billboard and everything works fine. wai ?
https://playground.babylonjs.com/#TMHF80#951
Set disableDepthWrite of the material to true can kill it. Maybe someone can explain the knowledge behind it ?
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@musk Thanks, you are awesome!! Marking as solved !
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A fix will be in the next nightly this should have worked 
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