This member will fire with any of the following pairs of parameters:
- loadingGui, dataTable
- loadingGui, nil
- nil, dataTable
The only instance where this event does not fire is with nil, nil, i.e. both parameters are not given.
This should be specified on the page, perhaps in the Type column (i.e. loadingGui should be a Variant<Instance, nil>, not just Instance) and also in textual description.