Purchased Album, All songs in iTunes, None Hidden, Same Apple ID, Songs Missing for Download on iPhone Music from Cloud

I have an album I purchased many, many years ago: The Essential Dean Martin

The entire album, all 30 songs, appears in my iTunes library on my computer.

The entire album, all 30 songs, appears in the iTunes STORE, available for purchase as a whole album, or individually song-by-song - either way. I would like to think that this shouldn't matter since I bought and paid for it a decade ago and you shouldn't be editing out what an album consisted of, anyway. But I still checked to make sure that these songs show up in that album.

On my iPhone, under the "Music" app, I can find the album. It lists all of the songs except for 2 available for download from the cloud. It is missing 2 songs for download from the cloud from the album: "Mambo Italiano" (song 11 in the iTunes library) and "Return to Me" (song 20 in the library).

On the phone, the songs are numbered 1-30, but skips from 10 directly to 12, and from 19 directly to 21. (In the iTunes Store, these are numbered as songs #1 and #10, respectively, on what would be "disc 2" if this were a physical album, but it's not one, and they don't get numbered that way in iTunes or on the phone in any event)

I have checked my account information, and on the screen where it says "iTunes in the Cloud", there is a section labeled "Hidden Purchases". I click on the "Manage" link. For the "Music" section, under both "Albums" and also for "Songs", it says "You have no hidden music purchases". So the songs are not hidden for download.

I am signed into both the computer and the phone using the same Apple ID. I've confirmed that, and also my phone asked me to confirm that I even could sign into this community forum from my computer. iTunes is showing the apps I've recently downloaded to the phone, etc.

I do not have an Apple Music subscription. I would like to think I shouldn't need one to listen to music I've outright purchased.

So, why are these two songs missing from the cloud for download to my phone when I've purchased them previously, they are still available for purchase, they are not hidden, and all of this was done using the same Apple ID?