Debugging without being able to see the values of different variables, strings, maps can increase the debugging time. While rendering STL containers should be understood as common-sense for the year 2020, CLion sometimes might not render them.
It happened that the same version renders the STL containers on some project and does not render on some others, even when they are started by the same user, in parallel.
The solution, or at least the trick, to solve the problem on CLion not being able to render STL containers seems to be changing the debugger.
It seems that the debugger does not have to be the one from your GCC. In this case changing the debugger to the Bundeled GDB made CLion to be able to render STL containers.
This is how a simple trick can solve the painful errors of not being able to render STL containers in CLion.