I do suspect that a lot of "our CI says this compiles on platform X" situations, for quite a few programs, are targeting arch/os combos that genuinely aren't getting tested, with only the occasional hobbyist poking at it every few months.
It wouldn't surprise me at all of most of those just crash-on-launch - or crash when you try to do anything, even though the CI builds them just fine and they pass the automated tests.
For an awful lot of boutique platforms, it's usually "literally one person" that drove the work to port it to that thing, and when that person's no longer actively doing the work, bitrot goes wild.
It wouldn't surprise me at all of most of those just crash-on-launch - or crash when you try to do anything, even though the CI builds them just fine and they pass the automated tests.
For an awful lot of boutique platforms, it's usually "literally one person" that drove the work to port it to that thing, and when that person's no longer actively doing the work, bitrot goes wild.