In the body of the email, the Facebook name is missing and the image/avatar/icon is broken.
In the subject of the email, the name is missing, i.e. it says “left a 5 star review” without anyone’s name. (It would be ideal if it at least said “Someone left a 5 star review”.)
I have replicated this 3 times in total (3 review triggers) and viewed the email on the following:
My mobile and my friend’s mobile
Gmail Android App and Gmail Web version
Desktop Gmail Web version
Note: it’s possible that Google CDN/image hosting doesn’t play nice
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Planned
🐛 Bug Reports
Over 1 year ago

Billy
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Planned
🐛 Bug Reports
Over 1 year ago

Billy
Get notified by email when there are changes.