In Magic Item Creation, Modifiers which should only apply while Attuned are active even without Attunement.

I've attempted to modify Elven Chain Mail to no longer impose Disadvantage on Dexterity (Stealth) ability checks, and to add an additional +1 bonus to Armor Class* [see EDIT] ONLY when Attuned from the Modifiers section, but the modifiers are being applied regardless of Attunement. The checkbox for the feature in Modifiers specifies when hovering over the question mark icon that checking it "Determines whether or not this specific modifier requires attunement regardless of the Item requiring attunement," which seems rather straightforward in its intention. 

I've adjusted the item, refreshed its page, refreshed the character sheet, and added the item on the character sheet. Each time, the features which should be attunement-locked automatically apply even when the character is not attuned to the item. Attuning to the item from the character sheet apparently makes no difference, either.

Obviously the workaround is simply to leave it always-active, and advise the players to pinky-promise they'll use it fairly, which isn't really a big deal, but I'd like the feature to work as intended.

EDIT: In Basic Information, if I mark the Requires Attunement box, it applies the attunement-locked Armor Class bonus appropriately (+1 without attunement, and +2 with attunement). But the Stealth Disadvantage remains freely available regardless of attunement status.

From the same Basic Information section, I've even tried selecting "---", "None", and "Disadvantage" from the Stealth Check drop-down menu to see if that would work, but it appears to make no difference

Quote from TheLaw9791 >>

I've attempted to modify Elven Chain Mail to no longer impose Disadvantage on Dexterity (Stealth) ability checks, and to add an additional +1 bonus to Armor Class* [see EDIT] ONLY when Attuned from the Modifiers section, but the modifiers are being applied regardless of Attunement. The checkbox for the feature in Modifiers specifies when hovering over the question mark icon that checking it "Determines whether or not this specific modifier requires attunement regardless of the Item requiring attunement," which seems rather straightforward in its intention. 

I've adjusted the item, refreshed its page, refreshed the character sheet, and added the item on the character sheet. Each time, the features which should be attunement-locked automatically apply even when the character is not attuned to the item. Attuning to the item from the character sheet apparently makes no difference, either.

Obviously the workaround is simply to leave it always-active, and advise the players to pinky-promise they'll use it fairly, which isn't really a big deal, but I'd like the feature to work as intended.

EDIT: In Basic Information, if I mark the Requires Attunement box, it applies the attunement-locked Armor Class bonus appropriately (+1 without attunement, and +2 with attunement). But the Stealth Disadvantage remains freely available regardless of attunement status.

From the same Basic Information section, I've even tried selecting "---", "None", and "Disadvantage" from the Stealth Check drop-down menu to see if that would work, but it appears to make no difference

Did you wait long enough for the magical item to be refreshed in the character sheet?