The Fusion Standalone based "Integrated Script Debug Console" window fails to load the breakpoint, step into/step out/step over, and go buttons in the Console window GUI.
This effects Fusion Studio 16 and Fusion in DaVinci Resolve Studio 16 on MacOS 10.13, Windows 10, and CentOS 7.6.
You can see the Integrated Script Debug Console is included as a notable key feature in the
Fusion 16 Feature Comparison Chart under the "Node Based Interface" section. It's listed as one of the selling points of Fusion's powerful scripting capabilities.
To quote that page "Integrated Script Debug Console. Step through code, set breakpoints and have multiple scripts open at the same time."

- Fusion Features - Integrated Script Debugger.png (73.51 KiB) Viewed 1072 times
Issue:Script debugging is broken and I can't step through scripts to debug errors.
Steps to reproduce:Step 1. Start Fusion.
Step 2. Open the Console window.
Step 3. The Integrated Script Debug Console icon resources aren't present in the Console in Fusion 16 or Resolve 16/16.1.

- Breakpoint Icons Missing.png (58.11 KiB) Viewed 1072 times
This appears to be a Console window rendering glitch as the resources are present in the "
Skins:/Fusion.fuskin" file that ships with Fusion 16.

- Script Debug Icons.png (75.46 KiB) Viewed 1072 times