iOS: Simulator fails when using iPad 2 or iPad Retina as device type

Steps to reproduce:

• have a Qt for iOS set up
• create a Qt Quick or Qt Widget app from template, select the iphoneos kits
• build & run project on simulator
• go to Projects -> select Run settings for current kit and select an iPad device (iPhone 4S was default, I've changed to iPad 2)
• build & run the project on the simulator

Current result:

• build succeeds, but running fails with

  Starting remote process.
  Spawning the Application process on Simulator failed. Spawning timed out.An error was encountered processing the command (domain=NSPOSIXErrorDomain, code=86):
  The operation couldn’t be completed. Bad CPU type in executable
  Bad CPU type in executable
  Run ended with error.

Note1: Using a different iPhone device seems to work, but using some iPad devices fails. (see comments, some work fine)
Note2: Switching from one of the working iPad devices back to iPhone devices seems to fail with the same error..

Additional note/question: Switching to watchOS or tvOS fails as well - do I need to install the respective simulators for this?