Just out of curiosity, do you use “Dialogue” > “Dialogue Lift” option with setting higher than 0?
manual.yamaha.com
No don't use dialogue lift, tbh I don't think a lot of people will notice the dialogue bleed in a 'normal' sized room, my lounge is quite literary a shoe box so when someone sits on either side of the sofa a rear speaker will be right by their head.
The thing is if Dolby say this is normal for the 'Dolby surround' decoding then fine, but I don't believe it's correct, DTS Neural x has zero bleed, Dolby 5.1 has zero bleed, Dolby Pro-Logic II on my older receivers also have zero bleed, unless 'Dolby Surround' is a new approach to up mixing 2.0 content something is amiss.