Adding properties to Blackboard makes it impossible to scroll to the bottom of the Blackboard

Steps to reproduce:

1. Create a new VFX Graph
2. Open blackboard
3. Add any property to the blackboard
4. Scroll to the end

Actual results: It is impossible to scroll because scrollbar always gets back to the top

Expected results: Blackboard elements can be scrolled to the end

Reproducible with versions: 6000.3.0a5(b2c6724a5f5f)

Not reproducible with versions: 6000.3.0a3

Can’t test with versions: 

Tested on (OS): macOS

Notes:

• Not reproducible with SG
• This bug affects both the scroll wheel and dragging the slider
• Closing VFX and reopening can be used as a workaround until a new property is added