Why does quickui#tags#tagfind() function different tags with the same name?

quickui#tags#taglist() gets all tags about tagname successful.
But quickui#tags#tagfind() removes tags leaving only one, even though thoes are tags different scope like class.

Additionally, I think searching tags in the quickui#tools#preview_tag should use existing vim functions.
Because, making ctags without -n option for "line" field is common.

Can you resolve this problem?