When using the feature "promote to variable" on a pin that represents a value that is not an engine default (Example: Floats = 0.0, Booleans = False, ect..), that default value (for the variable that was created) that is set as a result of using "promote to variable" will not be passed on to any actors that are children of it.
Example: Using promote to variable on a "make literal float" node that contains a value of 2.0 will set the default value of the variable that is created to 2.0 in the parent. However, this value will not be reflected in any children. Instead the value will appear as 0.0.
Result: The variable in the child is 0.0
Expected: The variable in the child would be the same as it is in the parent (in this example the value would be 2.0).
There's no existing public thread on this issue, so head over to AnswerHub just mention UE-61676 in the post.