This is likely Eclipse issue rather than OMNeT++, but I'll try it here anyway.
When I run a simulation in debug perspective, hit a break and hover over a variable, the value in the pop-up window window is incorrect.
It is different than the one you can find in the "Variable" window pane.
Clicking on the variable (sometimes multiple times) produces the correct value.
I can't take a screenshot since the popup window disappear when I click any key.
OMNeT++ version 5.4.1
with INET 4.0
OS: MacOS 10.13.6
Best,
m&M.