Fuji TCL strange vignette

[uhhuhthatsright]

Hello guys. I've just noticed (I'm ussualy not a pixel peeper) that when I shoot with my X100T and TCL on it, landscape at large apertures as for example f 4, I'm getting strange dark ring that looks like vignette, but only on JPEG files. It's not that visible when I shoot RAW.  I ussualy don't shoot landscape with large apertures, for sure, but it was one time and I've noticed that strange ring. So, because it's not visible on RAW files, I guess it has something with JPEG + TCL conversion inside of Fuji camera / software? When I shoot portraits, there's no strange vignette. When TCL is on camera, TCL mode is ON. Here's example, one is RAW file, second is JPEG. Both are just random shots from my balcony, hard processed because it's more visible if I pump colors and contrast. So, one is RAW converted to JPEG in lightroom, and the other is just Fuji JPEG.  JPEG has that strange ring in top corners that you will notice.

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[uhhuhthatsright]

Second one is Fuji JPEG. And just to be clear, I'm not talking about posterize effect caused by low image quality.