Can't access Niagara User Params of Array type in viewport

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Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Assets

Summary

User parameters of array type prepared on Niagara assets cannot be manipulated from Niagara Actors or Niagara Components on the level.
At the very least, Bool, Float, Position, and Vector 2D could not be manipulated.

Steps to Reproduce

1, Create a Niagara System.
2, Add array-type parameters as User Parameters.
3, Place it on the level.

Expected Result

It is desirable to be able to manipulate array-type user parameters as in UE5.

Observed Result

Even when selecting the corresponding Niagara Actor, the array-type parameters cannot be manipulated.

Platform(s)

Windows 11