Can you send us your Skyline document and at least one of your raw files?
In Skyline, you can use the menu item:
File > Share
to create a .zip file containing your Skyline document and supporting files including whatever chromatograms may have been extracted.
You should also send us at least one of your raw files. For Bruker, I think that means you should zip up the entire contents of your ".d" directory and send it to us.
If those two zip files are less than 50MB you can attach them to this support request.
Otherwise, you can upload them here:
I cannot think of anything that may have changed to make your chomatograms unavailable in Skyline 20.1.
A lot of times chromatograms are missing because none of the MS2 spectra matched the precursors in your document. That does not really apply to the stuff in your screenshot, since all of those are precursors, and they will match any MS1 spectrum.
Since all you have in your Skyline document are precursors, you might want to make sure that you really do have MS1 spectra in your data. Also, you should make sure that you have something other than "None" chosen at "Settings > Transition Settings > Full Scan > MS1 Filtering > Isotope peaks included".