My reference list are gone when I wrote and add more references

Hello there,

I just came across an issue that all my references crated by Zotero (APA 7) are gone. I refreshed the file and tried clicking the in-text reference, the reference list is still empty. I tried to copy a paragraph from another file to the file whose references are gone, it still did not work. The in-text references are grey, and I did not unlink them. How can I get the referenece list back, please? It's over 10-page references.
Thank you very much,
Qingli
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