How can there be "−1" total search results?

[rokejulianlockhart (Mr. Beedell, Roke Julian Lockhart)]

I visited about:cache?storage=disk, ^[1] and searched for #:~:text=google. Fenix returned “−1” total results:

What does this mean?

Environment

versionName=138.0a1

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1. stackoverflow.com/revisions/79514247/1 ↩︎

[rokejulianlockhart (Mr. Beedell, Roke Julian Lockhart)]

This is probably a bug, so I’ve reported it:

1954629 - I see "−1" search results at "about:cache?storage=disk".