Highlight furigana in japanese

[Nguyen Dat]

Calibre: 6.18.1

This is a epub book in japanese, so it use <ruby> tag for furigana.
For example: <ruby><rb>微</rb><rt>み</rt><rb>塵</rb><rt>じん</rt></ruby>
I just want highlight 微塵 but i can't.
Highlight order: 微->み->塵->じん.
If highlight end with じん, when reopen the book highlight will disappear, but in highlight tab doesn't disappear. When I click 'Modify', 'Error: Highlight text missing' and it disappear.
If highlight end with 塵, it's fine nothing happen.