选中“在加载时阻塞”有什么作用？（What does checking “Should block on load” do?）

选中“在加载时阻塞”有什么作用？（What does checking “Should block on load” do?）

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原论坛问答

问题1：

我一直在尝试流送关卡。当使用“加载流送关卡”蓝图节点时，有两个布尔值可以使用，第一个是“加载后可见”，这是不言自明的，但第二个则不然：“ 在加载时阻塞(Should block on load) ”。这个有什么作用？

I’ve been trying out streaming levels. When using a “load stream level” node there are two booleans you can check and uncheck, the first one being “make visible after load” which is self-explanatory but the second one not so much: “should block on load”.
What does checking this do?