If a rider was successfully grappled by an opposing threat, who had both mounted combatant feat and saddle of the cavalier would this dismount them from their steed?
Context: my character with both mounted combatant and saddle of the cavalier was attacked by a huge dragon, which could consume foes whole if successfully grappled and were at least Medium in size. I argued I could not be consumed while on my steed as while on my steed, the steed and I would be one large creature (warhorse - find steed). However, my DM ruled I could be dismounted from my steed if I was successfully grappled stating that saddle of the cavalier did not protect against attacks being made at me for being dismounted, only my steed. I disagreed as nowhere does the saddle of the cavalier state it only protects against attacks made at your steed that could dismount you, however respectfully followed the DM's ruling.
Saddle of the Cavalier states:
While in this saddle on a mount, you can't be dismounted against your will if you're conscious, and attack rolls against the mount have disadvantage.
And mounted combatant says:
While you are mounted and aren't incapacitated… you can force an attack targeted at your mount to target you instead.