If your snapshots are taken from your main subvolume, then they shouldn’t be incremental backups, so it should be safe to delete ones from the middle. It does look like incremental backups are possible, though I’ve never used that feature: https://fedoramagazine.org/btrfs-snapshots-backup-incremental/
If your snapshots are taken from your main subvolume, then they shouldn’t be incremental backups, so it should be safe to delete ones from the middle. It does look like incremental backups are possible, though I’ve never used that feature: https://fedoramagazine.org/btrfs-snapshots-backup-incremental/