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Unless the action is closed?
That is odd.
If the mags are new, your rifle may have a broken or warped mag catch. The closed bolt may somehow help the mag engage in the slot due to resistance? Don't have a Troy rifle so guessing.
No issue here and bought mine around March 2017. I have both Troy mag and the LAR15 metal mag. No problem here except action won't hold open with empty LAR15 metal mag while the factory Troy mag wont' allow me to close action with an empty mag.