Json artifacts on RlottieDevPanel

[Straticah]

Hey there i recognized a black shadow moving on my json lottie inside the dev panel, it remains when i implement that. Anybody has an idea where this comes from?
Artifact is very visible while moving the knob. It is not visible in 3 other viewers and in the original software.

json file:
Knob.json

[Straticah]

@Straticah here is a video to see it better