Turns out, yes it was. For Samba shares, SELinux requires every file to have the sudo semanage fcontext --add --type "samba_share_t" command run on it. And of course, the new files wouldn't have had this like the ones that were present when I was setting up Samba...
I expanded my search to making a post on the Fedora forums, where an @/glb pointed out that fact, and thankfully was able to also state that adding it to fstab for the drive will automate that process at boot. So the issue is now solved, thanks to glb over here: https://discussion.fedoraproject.org/t/file-sharing-woes-samba-nfs-sftp/91112/13