Please file an issue in our tracker, following the guidelines.
github.com/Scirra/Construct-3-bugs/issues
In this case the most important thing would be attaching an example project demonstrating the problem. I tried doing what you described myself in a new project, and it looks like it works as expected, so I am thinking there is something particular about your project which is not obvious.
If you can't reproduce the problem in a minimal project and don't mind sharing your project, including it in your issue is the next best thing.
If for some reason you can't share it on our public tracker, then you can send your project to me at diegozlr@construct.net and I will take a look.