Switching cmake generator for current active kit does not correctly update buildsteps

Steps to reproduce:

have a kit without a valid generator (see e.g. QTCREATORBUG-31129 )

have a configured project (cmake run succeeded)

I have usually some additional '--target ALL_BUILD' in the command line of the build step which works for vcxproj

changing the generator now to some different (NMake/NMake JOM) and reconfiguring with initial parameters does not automatically update the build steps as well, which makes building fail

Removing the still present build step and re-adding a cmake buildstep fixes the issue.
(just checking a valid target does not help, as the --target ALL_BUILD seems to be hard coded?)