Backports to release 1.12

[dkarrasch]

• Fix generic sparse-dense multiplication #663

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.17%. Comparing base (5d674dc) to head (392aa94).
⚠️ Report is 2 commits behind head on release-1.12.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.12     #664      +/-   ##
================================================
+ Coverage         84.15%   84.17%   +0.01%     
================================================
  Files                12       12              
  Lines              9179     9179              
================================================
+ Hits               7725     7726       +1     
+ Misses             1454     1453       -1     

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