Every distinct wording since 2010, newest first.
February 5, 2021 · Kaldheim
One Aura (Benevolent Blessing) gives the enchanted creature protection from a quality and says the effect doesn’t remove certain permanents that are “already attached to” that creature. This means that, when the protection effect starts to apply, any objects with the stated quality that are already attached to that creature (including the Aura giving that creature protection) will not be put into their owners’ graveyards as a state-based action. Other permanents with the stated quality can’t become attached to the creature. If the creature has other instances of protection from the same quality, those instances affect attached permanents as normal.
November 20, 2020 · Commander Legends
One Aura (Benevolent Blessing) gives the enchanted creature protection from a quality and says the effect doesn’t remove certain permanents that are “already attached to” that creature. This means that any object with the stated quality attached to that creature at the moment the protection effect starts to apply (including the Aura giving the permanent protection) aren’t put into their owners’ graveyards as a state-based action. Other permanents with the stated quality can’t become attached to the creature. If the creature has other instances of protection from the same quality, those instances affect attached permanents as normal.