api: fix handling of multiple conditions for buffering #601

Job	Run time
pytest-docker-py310-gcc-omp-arm64-adjoint	3m 2s
pytest-docker-py310-gcc-omp-base	3m 6s
pytest-docker-py310-gcc-omp-arm64-base	3m 4s
pytest-docker-py310-gcc-omp-adjoint	3m 6s
pytest-docker-py310-icx-omp-adjoint	3m 7s
pytest-ubuntu-py312-gcc13-omp-base	3m 7s
pytest-osx-py312-clang-omp-base	3m 7s
pytest-docker-py310-icx-omp-base	3m 5s
pytest-ubuntu-py311-gcc11-cxxnoomp-adjoint	3m 7s
pytest-ubuntu-py310-gcc14-omp-base	3m 5s
pytest-ubuntu-py311-gcc10-noomp-adjoint	3m 4s
pytest-ubuntu-py310-gcc9-omp-adjoint	3m 5s
pytest-ubuntu-py313-gcc14-omp-base	3m 8s
pytest-ubuntu-py310-gcc9-omp-base	3m 7s
pytest-ubuntu-py311-gcc11-cxxnoomp-base	3m 11s
pytest-ubuntu-py313-gcc14-omp-adjoint	3m 7s
pytest-ubuntu-py311-gcc10-noomp-base	3m 4s
pytest-ubuntu-py312-gcc12-cxxomp-base	3m 6s
pytest-ubuntu-py312-gcc13-omp-adjoint	3m 8s
pytest-ubuntu-py310-gcc14-omp-adjoint	3m 6s
pytest-ubuntu-py312-gcc12-cxxomp-adjoint	3m 7s
	1h 5m 9s

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