[11.x] Fix determining pivot timestamp column name(s) when parent relation missing one or both of timestamps #53103
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Currently timestamped pivots try to determine its timestamp column names from its parent relation. But parent model can have its
CREATED_AT
/UPDATED_AT
columns nulled out. This will lead to unexpectednull
return value fromBelongsToMany::createdAt/updatedAt
methods.This PR adds fallback values (default
created_at
/updated_at
column names) to fix this issue.