Vector Parameter Values do not show values with material instances

There is an issue where Vector Parameter Values do not show values with material instances. There is a workaround to get the parameter to appear as intended but setting the specific parameters using the Set Vector Parameter node. This issue does not appear to be a regression.

Versions Tested: Issue occurs in all versions tested
4.18.3 CL - 3832480
4.19p1 CL - 3837072
4.20.0 CL - 3813964

1. Create a new project (No template or starter content needed)
2. Create a new Material > Name it Master_Mat and open it
3. Press and hold 3 on the keyboard and then click in the material event graph
4. Right-click the new node and select the "Convert to parameter button" > name the new parameter Test
5. Create a new blueprint > name it Test_BP > open Test_BP
6. Recreate the blueprint provided in Screenshot_01
7. Add Test_BP into the level
8. PIE
   Result: The Vector Parameter is not printed
   Expected Result: The Vector Parameter is printed

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