SUMMARY
When moving around in Dolphin, the terminal panel is supposed to automatically cd to whatever directory is currently open. This does not always happen.

STEPS TO REPRODUCE
1. Open the terminal view
2. $ mkdir -p foo/bar
3. Open foo using the GUI
4. Open bar using the GUI
5. Go up one directory level using the GUI
6. Repeat steps 4-5

OBSERVED RESULT
Half of the time switching directories causes the terminal to cd to the new directory, and half of the time, it stays in the previous directory.

EXPECTED RESULT
Every time a directory change happens, the terminal cd to the new directory.

SOFTWARE VERSIONS
I observed the bug on two systems Kubuntu 18.04:
KDE Plasma Version: 5.12.6
KDE Frameworks Version: 5.44.0
Qt Version: 5.9.5
Dolphin Version: 17.12.3

and the KDE neon dev-unstable Docker image:
KDE Plasma Version: 5.14.80
KDE Frameworks Version: 5.51.0
Qt Version: 5.11.1
Dolphin Version: 18.11.70