It is not possible to query a single letter throughout the document

In the process of reading papers, I want to the meaning of a symbol in the formula, in Zotero version 6, it can be found globally, but Zotero version 7, I found that I can not find a single letter, I have to start with two letters, I think this is a BUG. And it can be inconvenient for some people.
https://s3.amazonaws.com/zotero.org/images/forums/u13927531/hduc1jkz0eow8ma9rlpz.png
https://s3.amazonaws.com/zotero.org/images/forums/u13927531/8jhd902o1moqam1bwx9q.png
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