I did use the latest update but the issue remains.
I have noticed the following issues:
Text colors remain once you keep them editable. If you select pixel perfect the recovering is happening to CMYK.
If you use a logo the same happens only if you import the logo as svg the colors remain correct.
Attached image:
The blue in the square bulb is the correct blue (the headline should be the same blue)
If you remove all imported images then the issue is also solved.
GR
G