Try to update BIOS. Choose OS = Windows to get latest updates.
Old HP laptops have UEFI boot marked as “Experimental”.
You may encounter this specific bug:
Microsoft is using FAT32 for ESP. This is standardized by UEFI Forum.
But openSUSE Leap 15.2 is using FAT16 for ESP by default for uncompatibility reasons.
Problem was solved in TW and Leap 15.3.
Check partition for /boot/efi to clear it up.
You may use legacy BIOS boot or use UEFI boot helper such as rEFInd.