Not sure if this is the best place to ask but can't find an existing thread.

I have an existing F ANA HND ORD YYZ booking. Was notified of a flight change on the ORD YYZ portion (QK to AC). I noticed that on the Aeroplan booking page, it says "Premium Economy" for the HND ORD portion. The fare class, however, say O. See screenshot below.

I'm probably worrying too much but this should just be a glitch on AC's end, and not an actual downgrade from F to PY right? PNR also shows F.