How to reproduce:
1. Open the submitted project (Cloth)
2. Select the Sphere GameObject
3. Activate the Cloth constraints editor
4. Note that the constraint nodes show up and are editable
5. Enter and exit Play Mode
6. Activate the Cloth constraints editor again

Expected result: the constraint nodes show up on the sphere and are editable
Actual result: the constraint nodes don't properly show up on the sphere and are not editable

Reproducible with: 2019.2.0a7, 2019.2.0a11
Not reproducible with: 2017.4.25f1, 2018.3.12f1, 2019.1.0f1, 2019.2.0a6
Could not test with:

Notes:
Deselecting and reselecting the GameObject starts showing the constraint nodes again