Fixed derivatives for matrix vector multiplication when matrix is spa… #2960

Job	Run time
codecheck / codecheck	44m 14s
docker / docker (fedora39)	20m 16s
linux / linux (-doc-mpi-)	42m 11s
docker / docker (rocky8)	23m 10s
linux / linux (-mpi-)	54m 35s
linux / linux (-coverage-mpi-)	1h 3m 3s
mac / macports (macos-12)	17m 37s
linux / linux (-debug-)	33m 51s
mac / macports (macos-14)	13m 55s
mac / macsimple (macos-12)	8m 20s
linux / linux (-debug-mpi-)	48m 22s
mac / macports (+allmodules, macos-12)	24m 20s
mac / macsimple (macos-14)	5m 13s
linux / linux (-intel-)	52m 5s
linux / linux (-pycv-mpi-)	16m 57s
conda / conda (ubuntu-20.04)	10m 11s
conda / conda (macos-12)	15m 58s
conda / conda (macos-14)	7m 7s
	8h 21m 25s

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