This can be considered the opposite bug of
QTCREATORBUG-983 but the effect of it is similarly irritating.
After already having built and deploed the application, The user introduces a compile error in his application. When he presses "play", those many alleged build errors appear (see
QTCREATORBUG-983) and in-between is the real build error.
However, since abld always seems to return 0 (no error) and there .sis old package ingredients from a prior build are still laying around, creator will ignore the build error and deploy the old version of the application.
The interesting part is that the build issues list reports many (in the example 10) errors. Nevertheless the app is deployed.
See screen shot and compiler output.