Ease node not considered Pure function but has no exec pins

Ease node not considered Pure function but has no exec pins. This causes a warning to appear within the compiler results as seen in the attached image.

Regression (yes) issue (does not) occur in 4.13.2

1. Open Editor (any project)
2. Create any blueprint
3. Create an "Ease" function
4. Compile

Results

Warning appears on screen:

"Node K2Node_EaseFunction_0. The node won't be pruned as isolated one. The node is not pure, but it has no exec pin(s). Verify IsNodePure implementation in K2Node Ease Function."

Expected

No warning appears on screen, blueprint compiles.