further fix TN2D/3D custom couplings #256

Job	Run time
run-tests (matrix, base, ubuntu-latest, 3.9, false)	1m 48s
run-tests (matrix, base, ubuntu-latest, 3.10, false)	1m 57s
run-tests (matrix, base, ubuntu-latest, 3.11, false)	1m 52s
run-tests (tensor, base, ubuntu-latest, 3.9, false)	7m 52s
run-tests (tensor, base, ubuntu-latest, 3.10, false)	9m 14s
run-tests (tensor, base, ubuntu-latest, 3.11, false)	9m 22s
run-tests (macos-latest, matrix, base, 3.11, true)	1m 22s
run-tests (macos-latest, tensor, base, 3.11, false)	4m 19s
run-tests (windows-latest, matrix, base, 3.11, false)	3m 58s
run-tests (windows-latest, tensor, base, 3.11, false)	13m 31s
run-tests (torch, tensor, ubuntu-latest, 3.11, false)	11m 18s
run-tests (jax, tensor, ubuntu-latest, 3.11, false)	10m 8s
run-tests (tensorflow, tensor, ubuntu-latest, 3.11, false)	9m 27s
run-tests (slepc, matrix, ubuntu-latest, 3.11, false)	1m 58s
	1h 28m 6s

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