After writing the timer code and connecting the HUD to the main scene, my created mobs disappear. How can I fix this?

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:bust_in_silhouette: Asked By KingVa

I make my game with video tutorial
and there, after connecting the HUD, the mobs do not disappear, but they disappear from me. So that you understand well what I’m talking about here is this video tutorial https://www.youtube.com/watch?v=WEt2JHEe-do&list=PL0FeKQsRZKKt1qMuqnQ7wJj0mQlH7FHxk&index=98&t=2415s and timecode where I’m having trouble is “55.24”
P.S
Sorry for this stupid question but I don’t know what to do anymore.