How to reproduce:
1. Open attached project "boltBug.zip"
2. In the Project window, go to Assets and select "test" Flow Macro
3. In the Inspector window, click "Edit Graph"
4. In the "Flow Graph" window, right-click on the grid

Expected result: fuzzy window appears
Actual result: fuzzy window doesn't appear

Reproducible with: 2020.1.0a21, 2020.1.0b15, 2020.2.0a17 (1.4.12)
Not reproducible with: 2018.4.24f1, 2019.4.3f1 (1.4.12)
Couldn't test with: 2020.1.0a1, 2020.1.0a20 (console errors) (1.4.12)

Notes:
Reproduced with macOS Catalina 10.15.5
Right-clicking inside the "Flow Graph" window, then typing "int" i.e., waiting a few seconds and pressing enter twice creates a new node of type int, so the fuzzy window is there, although it's not rendering
Not reproducible with Windows 10