Plugins can add their own menu commands in different menus.
Specifically in Select menu, they get treated weirdly.

Normally, without any plugins installed, the bottom of Select menu looks fine, like this:
Save Selection...
Edit Selection...
Update Selection ← this is a new command added recently
<end of menu>

When at least one saved selection is added, Ai adds a horizontal separator and list saved selection under it:
Save Selection...
Edit Selection...
Update Selection
————————————————
My Amazing Selection
<end of menu>

Again, descent.
But with plugins onboard it looks like the attached image.
All plugin items are placed under the separator, above the saved presets (and if no selections are saved, there is no separator even).

Not OK, and it always bugged me.

The order I think makes more sense is this:
Save Selection...
Edit Selection...
Update Selection
————————————————
My Amazing Selection
————————————————
Plugin items
<end of menu>

It makes the saved selections closer to their corresponding commands, and separates them from plugin items. Surely, when no selections are saved, the separator still should be there, to separate plugin ones from native commands.

The developer told me they add the menu commands to the kSelectMenuExternalGroup, 'as prescribed by Adobe'.
Within that menu group (not alphabetized), the menu items are added in whatever order the plugins are loaded. The developer has no control over where Illustrator chooses to add its saved selections and possibly its separator.

Please address this.