That’s a bummer, sorry man. That is super rare though, I’ve never heard of that happening to anyone else in my 10+ years of Linux life. Don’t let it keep you from trying it again. I guess that is a testimony to the importance of backups, especially when working with partitions.
OP, the most trouble I’ve ever heard of or experienced myself was some GRUB issues, which are just a matter of the bootloader recognizing that there is a windows or Linux partition alongside whatever is being booted up. There are a ton of tutorials on how to address that type of issue though, it’s usually a matter of one or two commands in a terminal or command prompt.