No line of a file marked as hit/partial/missed

Description

When I look at:

I see that 31 lines of the ‘concurrent_hash_map.hpp’ file are missed, but when I want to check which lines are missed…

I do not see any line are marked as hit/partial/missed.

Repository

Steps to Reproduce

  1. See: https://codecov.io/gh/pmem/libpmemobj-cpp/tree/master/include/libpmemobj%2B%2B/experimental
  2. See: https://codecov.io/gh/pmem/libpmemobj-cpp/src/master/include/libpmemobj%2B%2B/experimental/concurrent_hash_map.hpp
  3. See Description

Expected behavior:
Lines of the ‘concurrent_hash_map.hpp’ file are marked as hit/partial/missed.

Actual behavior:
No line of the ‘concurrent_hash_map.hpp’ file is marked as hit/partial/missed.

Flakiness?
Always

Versions

Arch Linux, Google Chrome, Version 76.0.3809.87 (Official Build) (64-bit)
and
Windows 10, Google Chrome Version 76.0.3809.100 (Official Build) (64-bit)