I try to search the keyword "5.10" in the PDF file https://arxiv.org/pdf/2105.02456.pdf which returns "No result". However, there are several occurrences of "5.10" in the PDF, e.g. on page 22.
(MuPDF search is capable to find this keyword in the PDF.)
Librera Reader version: 8.9.46-fdroid
I try to search the keyword "5.10" in the PDF file https://arxiv.org/pdf/2105.02456.pdf which returns "No result". However, there are several occurrences of "5.10" in the PDF, e.g. on page 22.
(MuPDF search is capable to find this keyword in the PDF.)