Some MemberUpdate events seem to be missed ?

[pine gale]

I have some code in

 async def on_member_update(self, event, session):
        before = event.before
        after = event.after

And I check for changes in Roles, display_name or Icon
It appears to mostly work..
But sometimes Icon changes appear to be missed ?

In on_ready I go through all members and check their current Icon to the known Icon and each time I run on_ready there are 5-10 icons to be found incorrect out of ~40K users the bot can see.
Is it possible discord just doesn't send the event or i.py just doesn't propagate it or something ?

[quasi kettle]

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[pine gale]

before.guild_avatar.url if before.guild_avatar else before.avatar_url) != (after.guild_avatar.url if after.guild_avatar else after.avatar_url