Filter Pinyin Support when check Regex

Just like the topic Search using Chinese prefix pinyin?
Indeed, now pinyin support at Find-As-You-Type Find mode and filter mode.
But I find the when click the regex support in filter mode. The pinyin support is invalid.
Sometimes I need the pinyin filter with regex. Just an example:

This test files all English may be Pinyin.txt

if I close regex with just pinyin support:

If I chose regex mode only:

They all work well separately.

If I chose pinyin with regex:

The pinyin support is not working.