What does a grey icon on snapchat mean?

I know normally that the grey received icon means that the person I added you or something, but with this convo the person is still added. Additionally the person does not show up on the home page where all react snap conversations are added in order (even tho the person was snapped recently). Can someone explains what this means. The snap chat website only says the conversation is pending/expired so I am confused on what expired may mean

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