Vast Desert Gold Golgonda not working

  1. Bug description
    Can’t activate the on field effects of Vast Desert Gold Golgonda to discard a Sprigguns monster to summon an Xyz from the extra deck, despite having available targets and no monsters on the field.

  2. Bug reproduction steps

Activate Vast Desert Gold Golgonda from hand.
Be unable to activate its effects on field.

  1. Screenshot OR error code
    No activate option is available.

  2. Expected behavior
    Should be able to activate the effect in order to discard a Spriggun card to summon an Xyz from the ED.