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Nothing happens to that file during/after export except for your viewing setup is clearly not to standards for video work.
PrPro works in Rec709, the international standard for broadcasting video. Which specifies sRGB color profile for viewing on monitors and TVs at a typical gamma of 2 2 or 2.4 depending on room brightness.
Within the app, PrPro does it's best to display according to the standards. If you import the clip back into PrPro it will look as it did.
If you view it outside PrPro on non-standard gear, it can't. Period.
Many newer Macs use P3 space monitors without any OS setup to properly reconfigure for Rec709, so the sRGB file looks washed out, somewhat desaturated.
Quicktime player is infamous for being color stupid. Chrome and Safari the same, they pay no attention to color tags in media. Firefox is the only browser that does.
VLC and Potplayer tend to do much better with respect for color management.
And this has been discussed in at least four threads a week for the five years or so I've been working video.
Have you solved this issue yet? Are you on Mac or PC?