Players with the invisibility effect are still easily recognizable when under the glowing effect.
To reproduce:
/effect @p invisibility
/effect @p glowing
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I think it's so you can see them through walls.

I think this is intended, it does the same for entities too, and I think (not sure) dinnerbone actually showed this at minecon
Isn't Glowing used by players to track hidden players wherever they go?