If you select the spell on level up it does not get stripped from your spell list, allowing you to infini cast the spell just like all your other spells. It does not get removed on log out, server reset or subsequent level ups, although actively removing it from your spell list on level up does remove it.
Similar issue was had when the first wave of new spells were added to the game.
Feylock gains access to Bears Endurance spell
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