refactor: optimize m2m add logic (#1620) #1359

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Job	Run time
test (3.8)	7m 33s
test (3.9)	7m 52s
test (3.10)	8m 1s
test (3.11)	8m 3s
test (3.12)	10m 59s
Finish Coveralls	4s
	42m 32s