Basically, we don't assume the creation of a character or artifact suddenly assumes the creator is above everything they created if there is 0 mentions of anything. Especially if they're surprised by how potent their creation is, or if they're able to great wishes that the creator cannot, or if characters have powers that the creator never expected them to have.
But if a purpose of some artifact is literally to "Bestow a small fraction of the creator god's power", I would put that as an examples. Such as the thing Celestia and Luna gave to Twilight before Twilight mastered moving the sun and moon with her own power. I also generally tend to believe if the "Creator of everything" is also stated to be the "Embodiment of all creation" and is pretty much portrayed as the literal god tier of the verse second to none and has like 0 anti-feats. Those are especial examples who upscale from creations. Also, I recall
Kefka Palazzo being the literal god of all magic being his justification for why he upscales from his creations and other magicites was a reason why he upscales from various characters and has basically all in game magic being canon.