Execution reroute nodes become wildcard reroute nodes when creating a second reroute node off the same execution pin

Execution reroute nodes become wildcard reroute nodes when creating a second reroute node off the same execution pin. Note: this does not appear to affect their functionality as execution reroute nodes.

Reproduced in 4.8.3 binary, 4.9.1 binary, and Main (CL 2699173)

1. Open any project
2. Create a new Actor Blueprint
3. Drag off the Event Begin Play node and select Add Reroute Node
4. Drag off the Event Begin Play node again and select Add Reroute Node

Result:
Both reroute nodes will be grayed out as Wildcard types. Note that they still function as Execution type reroute nodes.

Expected:
Both reroute nodes maintain the white Execution type.