MacBook Pro Late 2013 ok-ish with Sequoia 15.7.2.

I just updated my MacBook Pro Retina, 15-inch, Late 2013 to Sequoia 15.7.2. and almost everything runs just as expected. Awesome!

One weird thing is though, that my Quad-Core Mac now seems to have 8 cores - at least in the Activity Monitor! Yeeha! 🥳

So far the only bug I have noticed seems to be that using the tool "Adjust Colours" in the Preview application somehow corrupts the image and deletes the image content. Also clicking "Auto Levels" corrupts the image - but "Reset All" restores it again.

Is it just me?