WebM videos flicker with a transparent pixel format on Lambda

[JonnyBurger]

I tried using same composition to create the video, created one with mp4 and another one with webm
I used following configuration with renderMediaOnLambda

let renderMediaOnLambdaProps = {
region,
functionName,
serveUrl: awsServerUrl,
framesPerLambda: 20,
inputProps: userProps,
codec: 'h264',
imageFormat: 'jpeg',
crf: 9,
maxRetries: 1,
jpegQuality: 100,
composition: lambdaCompositionV4,
privacy: 'public',}

For webp
let renderMediaOnLambdaProps = {
region,
functionName,
serveUrl: awsServerUrl,
framesPerLambda: 20,
inputProps: userProps,
codec: 'vp8',
imageFormat: 'png',
pixelFormat: 'yuva420p',
crf: 9,
maxRetries: 1,
composition: lambdaCompositionV4,
privacy: 'public',
}

https://github.com/remotion-dev/remotion/assets/1629785/bf61ec05-56aa-4728-8cb0-7501cc1a7340
out (2).webm