fix the nans in accumulated transferlib bug #804

Job	Run time
Test 'loose' on macos-13 / Unit tests [macos-13]	3m 31s
Test 'loose' on macos-13 / Unit tests [macos-13]	3m 35s
Test 'loose' on macos-13 / Unit tests [macos-13]	3m 32s
Test 'loose' on ubuntu-latest / Unit tests [ubuntu-latest]	3m 18s
Test 'loose' on ubuntu-latest / Unit tests [ubuntu-latest]	3m 23s
Test 'loose' on ubuntu-latest / Unit tests [ubuntu-latest]	3m 14s
Test 'loose' on windows-latest / Unit tests [windows-latest]	3m 24s
Test 'loose' on windows-latest / Unit tests [windows-latest]	3m 23s
Test 'loose' on windows-latest / Unit tests [windows-latest]	3m 25s
Test 'stable' on macos-13 / Unit tests [macos-13]	3m 11s
Test 'stable' on macos-13 / Unit tests [macos-13]	3m 8s
Test 'stable' on macos-13 / Unit tests [macos-13]	1s
Test 'stable' on ubuntu-latest / Unit tests [ubuntu-latest]	3m 11s
Test 'stable' on ubuntu-latest / Unit tests [ubuntu-latest]	2m 56s
Test 'stable' on ubuntu-latest / Unit tests [ubuntu-latest]	3m 10s
Test 'stable' on windows-latest / Unit tests [windows-latest]	2m 59s
Test 'stable' on windows-latest / Unit tests [windows-latest]	3m 5s
Test 'stable' on windows-latest / Unit tests [windows-latest]	3m 0s
	55m 26s

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