Hey, thanks so much for the detailed report, really appreciate it. I'm away on vacation right now so updates will be a bit slower, but I already found both issues.
Winter Sky's 4/5 was a real display bug, one of the zones was defined as empty so its star could never light up even at 100% completion. That's fixed for the next update, you weren't missing anything there.
Deep Sky only showing the Double Cluster is because the other two hidden patches become locked once you commission the Starlight Laboratory before diving into them. I can't recover that on your current save, sorry, but I will add a warning on the commission screen so this won't catch anyone off guard again.
Thanks again for taking the time to write this up, it really helps.