I bought an XM4 yesterday, not long after 2 hours of use I heard the same wind noise on the right unit. The manufacture date of mine is 11 2021, latest firmware updated as soon as they connected to the app. I read the last 9 months of this thread before buying them so knew there was a chance I'd have the same experience as you. I don't want to return to amazon and buy another set because it's too likely I'll just get another dud.
You said Sony charge if they don't find anything wrong, I don't like the sound of that. Have Sony got back to you about this? Outside of this issue I absolutely love the sound quality and features and can't decide what to do, it was a choice between the XM4 and the Bose but I've read they have their own technical issues. Ironically I bought these just for ANC and now I don't want to give them up for the tuning and Ambient mode is super convenient and better than my LG Tone Free FP9. But I have misophonia and there's no way I can put up with that wind sound during quiet parts of music.