RVT artifacts suddenly appeared

As shown in the topic,when I was working,I suddenly noticed that there’s something wrong with my scene,which are all related to RVT.I have restarted UE and my computer,but it didn’t work。
Does any of you know why this is?I would be grateful if anyone could answer me。
By the way , my ue version is 5.0.1.
Thank you ~

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OK, finally I found that It’s because my virtural textures have been missing. This seems to happen often and unexpectedly.