My source is this Tumblr post, which caused me to check my settings because I just got the latest major update.
I found these settings enabled in my discord app:
I know ideally one wouldn’t use Discord at all, but so many of the nice little people in my phone are on Discord.
BTW it’s never a good idea to allow apps access to your contacts, other than your actual phone and SMS apps.
Stay safe!
Just to throw in my two cents… I’m on iOS version 207 (which appears to be the latest) and this setting was not on for me.