Extracting disc contents then converting/reassembling to ISO won't play on a real Wii

[Nintendo Maniac 64]

As you may or may not know, you can use Dolphin to extract the entire contents of a disc and then similarly use Dolphin to reassemble those extracted files back into a new ISO:

Click for details on the process that I'm referring to: (Show Spoiler)

1. in Dolphin, right-click on your game of choise and select Properties
2. click on the Filesystem tab
3. right-click on "Disc" and select Extract Entire Disc
4. choose a location where you want to extract to and click Select Folder
5. wait a bit (the progress bar and percentage completed will be deceptive)
6. in Dolphin, make sure that the location mentioned in step #4 is in Dolphin's "Paths" so that Dolphin can find it - it should then appear on Dolphin's game list
7. right-click on the newly-appeared game and select Convert File...
8. make sure "Format" is set to ISO and then click Convert...
9. type the file name of your choice and select a location to save a new ISO and click Save
   

However, I just recently discovered that ISO files created this way do not actually work on real Wii hardware (at least not when launched via USB Loader GX).  This surprised me as the process doesn't really seem all that different from what you've been able to do with Wii Backup Fusion for what has to be more than a decade now, yet extracting the entire contents of a disc through Wii Backup Fusion and then similarly reassembling the extracted files back into a new ISO file via Wii Backup Fusion will result in ISO iles that "just work" on real hardware.

So simply put, is this expected behavior?


For reference, this was tested with Link's Crossbow Training as well as Metroid: Other M - in fact it was when I was trying to get Other M Maxximum Edition working on real hardware that I discovered this issue and then decided to confirm if it also occurs with Link's Crossbow Training (since that game has a much smaller file size which made things easier to deal with).

And in terms of Dolphin versions, it was tested using some 9-month old beta version from May 2021 as well as the recent 2022-02-01 beta version, but the results were identical either way. And speaking of Dolphin, ISO files created by both Dolphin and Wii Backup Fusion will run just fine in Dolphin.