Small: Fix bug in sparse packs that include fluxes #4543

Job	Run time
CI-Rocm-HIP (hipcc, Release, hip, serial)	29m 57s
CI-Cuda-Host (g++, Release, cuda, serial)	36m 37s
CI-Rocm-HIP (hipcc, Release, hip, mpi)	30m 48s
CI-Cuda-Host (g++, Release, cuda, mpi)	38m 49s
CI-Rocm-HIP (hipcc, Debug, hip, serial)	51m 32s
CI-Cuda-Host (g++, Release, host, serial)	10m 40s
CI-Rocm-HIP (hipcc, Debug, hip, mpi)	51m 24s
CI-Cuda-Host (g++, Release, host, mpi)	11m 10s
CI-Cuda-Host (g++, Debug, cuda, serial)	1h 9m 44s
CI-Cuda-Host (g++, Debug, cuda, mpi)	1h 8m 4s
CI-Cuda-Host (g++, Debug, host, serial)	9m 54s
CI-Cuda-Host (g++, Debug, host, mpi)	9m 54s
CI-Cuda-Host (clang++-15, Release, cuda, serial)	24m 6s
CI-Cuda-Host (clang++-15, Release, cuda, mpi)	24m 51s
CI-Cuda-Host (clang++-15, Release, host, serial)	9m 5s
CI-Cuda-Host (clang++-15, Release, host, mpi)	9m 16s
CI-Cuda-Host (clang++-15, Debug, host, serial)	7m 0s
CI-Cuda-Host (clang++-15, Debug, host, mpi)	7m 4s
	8h 19m 55s

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