Append node appears to flicker when placing ~3 spaces in a pin

Append node appears to flicker when placing ~3 spaces in a pin. The pin does not appear to be able to choose a size and so it flickers randomly between them

1. Open the editor
2. Open the level blueprint
3. Add an append node to the graph
4. place three spaces in the top pin
5. Notice that the pin starts to flicker and change size (user linked a video for reference)

Expected: The pin would choose a size for the pin being used
Result: The pin does not appear to be able to choose a size and so it flickers randomly between them

Laggy tabulation symbol display (minor bug)