Member.display_banner can wrongfully return None

[ToothyDev]

Summary

Member.display_banner will wrongfully return None if there is no guild-specific banner, but a global banner

Reproduction Steps

1. Set a banner for your account, make sure you don't have a guild-specific banner in the guild you test this in
2. Make a member command (or similar) where you can get your member object, and print member.display_banner
3. It will be None despite there being a banner (your global one)

Minimal Reproducible Code

@discord.user_command()
async def bannertest(self, ctx, member):
    await ctx.respond(member.display_banner)

Expected Results

I expect Member.display_banner to have the same fallback to the globally set Asset like Member.display_avatar does

Actual Results

The fallback (it is there in the code) doesn't fetch the User object when returning the fallback user banner. Since User.banner is only available via fetch, this will always be None

Intents

All of them

System Information

• Python v3.13.2-final
• py-cord v2.6.1-final (idk why it says this, I'm using the git version)
• aiohttp v3.11.18
• system info: Windows 11 10.0.26100

Checklist

• I have searched the open issues for duplicates.
• I have shown the entire traceback, if possible.
• I have removed my token from display, if visible.

Additional Context

No response

[NeloBlivion]

fix details:
ConnectionState.store_user returns the user if it already exists, without updating any attributes. That means fetch_member on an already cached user will never have Member._user.banner filled, as User.banner is only available on fetch (for some god forsaken reason.)
I'm not sure if it's entirely wise to always update the inner user, should be investigated further.