Fix linear blend regression
Fix linear blend regression

Regression introduced by 4aa830bb6be9
Issue #13919

vovythevov/Bender,ricortiz/BenderCraniosynostosis,ricortiz/Bender,finetjul/bender,ricortiz/BenderCraniosynostosis,ricortiz/Bender,finetjul/bender,finetjul/bender,vovythevov/Bender,ricortiz/BenderCraniosynostosis,ricortiz/BenderCraniosynostosis,ricortiz/Bender,vovythevov/Bender,ricortiz/Bender,finetjul/bender,vovythevov/Bender