I've got a homebrew item I made for a player of mine (a paladin) that adds +1 to his Spell Save DC. It seems to works fine with all of his spells except the cleric cantrips he gets from the Blessed Warrior fighting style. Is there another modification in the homebrew settings I should be looking at to change this or is it just not possible for whatever reason? Thanks

This isn't limited to homebrew items either, as a Staff of Power also does not grant the buff to those cantrips.

As expected, this error applies to the ranger side as well, with spells such as Thorn Whip and Gust remaining unaffected by spell-boosting items.