The pin is missing the checkbox or dropdown to set the switch value on the function call node. It should only look like the screenshot if the switch value is propagated to the next higher caller.
1. Use StaticSwitchInput in NiagaraFunctionScript
2. Use that NiagaraFunctionScript in DynamicInput
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-87389 in the post.