1. What happened

After adding rules in the .collabignore file that worked properly with Unity Collaborate v2.0.0-preview.17 in Unity Editor 2019.1.2f1, upgrading to Editor 2019.1.10 and .11 both ignore those rules, allowing all changes to be published.

2. How we can reproduce it using the example you attached
a. Open the project and sync it with Collab.
b. Make some changes to the materials in the Ignore and Test folders.
c. Open the .collabignore file.

Expected: The Assets/Ignore/, Assets/Test/ and Assets/Foo/ folders (and their contents) should have ignore icons over them in the Project Browser and changes inside of them should no be listed in the Collab Toolbar.
Actual: Those folders do not have the ignore icons on them and changes made in them are listed in the Collab Toolbar, even after pressing Rescan.

Reproduced in: 2018.4.1f1, 2019.1.10f1, 2019.3.0a5 when using Collab v2.0.0-preview.17.
Not Reproduced in same versions when using 1.2.16 of Unity Collaborate package.