test: reproduce Preload callback clone=0 issue #838
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Since v1.30.0, the *gorm.DB instance passed to Preload callbacks has clone=0, causing chain methods to modify the same instance instead of creating new ones. This test demonstrates the issue by reusing the db variable with multiple Where() calls in a Preload callback.
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Since v1.30.0, the *gorm.DB instance passed to Preload callbacks has clone=0, causing chain methods to modify the same instance instead of creating new ones. This test demonstrates the issue by reusing the db variable with multiple Where() calls in a Preload callback.