Insert_textbox incorrectly splits English words in CJK-mixed text

When using Page.insert_textbox()to insert mixed Chinese and English text

“Van Dyke等人进行的一项回顾性病例系列研究强调了三份独立病例中Elevess引起的严重急性局部反应和结节性无菌性脓肿的形成。”

the automatic line-breaking logic treats English as words and CJK as characters. This causes premature line breaks after English words. It looks like this:

Van Dyke
等人进行的一项回顾性病例系列研究强调了三份独立病
例中 Elevess
引起的严重急性局部反应和结节性无菌性脓肿的形成。

we tried add or remove space between Chinese and English characters, but none looks normal. How can we achieve proper line breaking?