Just tested this with a few different settings and found the issue! Sombra’s hacked health packs can’t be seen through walls if you change the friendly UI color!
I had been wondering why I coudlnt see them! This is why, and its a huge, actually game breaking bug! (My testing has only allowed me to test on Xbox. This may be a console only bug. I don’t know. But it’s still a big deal.) And they are not aware of this bug! Check for yourself!
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Also when you change friendly UI, groupmates don’t appear green (IE, differently than your other teammates).