Misreported coverage numbers

In case anyone is watching this, I'm having trouble getting the code coverage numbers to be reported correctly. Right now, the code in `src/collective/restapi/navigationtree/browser/get.py` supposedly is covered at only 27%, which is basically just static coverage (reading the file without executing any of the callables). But that's BS. I put breakpoints in all the methods, and they do get hit when the tests run, so the number should be much higher.
If anyone has any idea why or what I'm doing wrong, I'd appreciate any hints.