DiscordMember lacks of user properties when the cache is empty on Guild Member Removed event

Created by: FenikkusuKoneko

Summary

The DiscordMember entity doesn't use the DiscordUser's properties, instead it searches this in the user cache.

Details

I found that the DiscordMember entity doesn't have the username, discriminator, avatar, basically all the general fields from the DiscordUser entity when this is not in the cache. I was searching the cause of this and I found that DiscordMember searches the user in the user cache then it uses its properties. I found this problem in the Guild Member Removed event when I started my bot with the cache empty. I believe Discord sends the full data of the user that left the server.

Steps to reproduce

1. Start the bot with the cache empty (i.e. have only the member intent enabled or not)
2. Try to access member's username in the guild member removed event
3. You will get a KeyNotFoundException