After the upgrade, the close icon is blank

wwbb1
When I upgraded Zotero to version 7.1-beta.18+679de040e (64-bit), the icons for minimizing, restoring, and closing the software page in the upper right corner became blank.
https://s3.amazonaws.com/zotero.org/images/forums/u16615061/dda5kvbxvc87mv2zg9wv.png
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