fix(model): Fix edge case crash in bulkCreate ( #9796)

[andrewAtPaymentRails]

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Description of change

Closes #[9796]

[codecov]

Codecov Report

Merging #9797 into master will not change coverage.
The diff coverage is 100%.

[sushantdhiman]

Thanks, this issue has been brought to my attention at-least one time #9274, why set is used is basically unknown :D

As this PR aligns bulkCreate with save, I am accepting this change.