Apple Mail truncating posts?

Like many others, last week I updated to Monterey 12.2.1, all going smoothly. But today a mail from a list at Google Groups arrived severely truncated in Mail – several paragraphs missing.

At first I suspected GG, they’ve introduced flawed changes there in the past. But checking the same post in a number of other clients (Proton Mail, Postbox & Outlook) showed it arriving intact.

Just wondering if anyone else has had this experience with Mail (V.15.0 now).