Steps to reproduce:

• open/create a Quick Application from template, add some code to be able to stop at breakpoints
• add a breakpoint inside the cpp part and another one inside the qml part
• start debugging
• trigger the breakpoint in cpp, trigger the breakpoint in qml
• disable the breakpoint in qml, trigger it again
  • debugger does not stop (fine)
• re-enable the breakpoint in qml, trigger it again
  • debugger still does not stop (bad!)

Note: Removing the breakpoint and setting it again does work as expected.

2nd Note: This also seems to work if the breakpoint is located inside a Connections {} construct.