Image in ViewportFrame looks different

As of a few hours ago, while working a game, I noticed the mini-map’s appearance has changed. It is now darker, looks quite different from the original image. The mini-map is implemented as a Decal inside a ViewportFrame facing the camera. This issue affects both Roblox Studio and the live game client. I checked the published version, that wasn’t updated for a few days, and the texture appears darker there as well

This is how the image always looked:

This is how it is looking now:

A private message is associated with this bug report

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Seems like increasing BackgroundTransparency also darkens ViewportFrames:
(left ViewportFrame, right Frame)


Maybe this black outline bug and this darkening bug are related to a recent ViewportFrame change?

Model: ViewportFrame_Transparency_Bug1.rbxm (4.9 KB)

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Marking issue Closed/Fixed - related to FFlagPremultiplyViewportframeBackgroundColor causes viewport background color to render incorrectly