Hi Mike Lee (BOSTON),
Thank you so much for this excellent post.
You helped me track down an issue with the Modern News Web Part that has been bugging us for months.
We were getting CALL STACK: Error: UnexpectedRetryableError referencing
spoprod-a.akamaihd.net/files/sp-client/sp-dataproviders_en-nz_d963ee69f4b838a804bae9d8a288a695.js:1:63508
But it was actually being caused by two search schema managed properties with the same name or alias
https://techcommunity.microsoft.com/t5/sharepoint/sharepoint-modern-news-webpart-quot-something-went-wrong-quot/m-p/1351835/highlight/true#M40685
Again Many thanks
Microsoft