Cant choose Child Actor Class

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I am creating a blueprint that will spawn blocks that break when a ball hits them, but in the Add Child Actor Component node I cannot select the blueprint of this block

As in, you can select it but it reverts to None, right? Are both blueprints compiled?

Assuming - You are not able to Click/ select the Bp_Cube try setting it on the BeginPlay in Event Graph…

if not Elaborate the Problem