Coverage and macropy

When using the with macro block Coverage.py fails to detect some sentences.

Here is a small example to show it. The mymacros.py contains a macro that was reduced to do nothing.

Running make you can see how 3 lines in application.py are marked as uncovered.

I commented these lines in the code with # <--- Not covered?

The coverage version used is the Debian stable one:

Coverage.py, version 4.5.2 with C extension
Documentation at https://coverage.readthedocs.io

I also tried the code from GitHub (installed on my user:

Coverage.py, version 5.1.1a0 with C extension
Full documentation is at https://coverage.readthedocs.io/en/coverage-5.1.1a0