I rebuild a lot of buckets but mostly front end loader buckets where the owners put a smile in them because they don't use an excavation bucket but a light duty material bucket instead. removing the smile isn't cheap.
Bobcat Toolcat 5610G, Deere X744, Cub Cadet IH 982
The strip of metal the shanks are welded too is of questionable grade/quality. It looks too brittle for the application (see crystallized grain structure). Once the cracks get back to the bucket metal, they stop. If this happens too often, rebuild it.