When to use and when to not use add_child.call_deferred?

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1

Godot Version

4.6

Question

I came across this error sometimes:

ERROR: Parent node is busy setting up children, `add_child()` failed. Consider using `add_child.call_deferred(child)` instead.

In _ready() function during project start running, add_child alone will fail, so call_deferred has to be used.

So should call_deferred be used everywhere? When to use and when to not use it to ensure the game will not have any issue?

2

No. Use it only when you get that error.

Better yet eliminate the error by not trying to add or alter siblings from _ready(). Do everything in parent’s _ready()

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