Unreal Engine code plugin distribution on FAB

I have the same question as @Kibibyte. If plugins are restricted to three latest engine versions, why do we have the option to edit these older releases? I’m also a little bit confused about why did the migration process even bring these releases to FAB if they are not supported?

At the end of the day I suppose it doesn’t really matter, but a little more clarification would be appreciated. Thank you!