An edge with the same input and output already exists error is thrown when operators are connected to blocks

Steps to reproduce:

1. Create a new 'Simple Loop' VFX
2. Create float operator
3. Connect that float operator to Set Lifetime A and B slots

Actual results: an error is thrown

Expected results: no errors are thrown

Reproducible with versions: 6000.4.0a2, 6.3, 6.2, 6.1, 6.0

Not reproducible with versions: 6000.4.0a1 (78e8bdc40887)

Tested on (OS): macOS