fix parent models fields leaking into values and values_list

[collerek]

Resolve: #1060

[codspeed-hq]

Merging this PR will degrade performance by 13.45%

❌ 1 (👁 1) regressed benchmark
✅ 97 untouched benchmarks

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
👁	WallTime	test_making_and_inserting_models_in_bulk[40]	15.8 ms	18.2 ms	-13.45%

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_{Comparing fix-issue-1060-main-model-leak (63ddb6b) with master (001578d)}