<Toc> component can not display normally,when mode="onlyCurrentTree"

[hustabubu]

<Toc> component can not display normally,when mode="onlyCurrentTree"
I have three md: slides.md, chapter1.md, chapter2.md.
Three <Toc> in three slides can displays (content is correct), but disappear immediately.
Am I not using it correctly, or is it a bug？

slides.md

---

slides.md 的目录

<Toc minDepth="1" maxDepth="3" mode="onlyCurrentTree"></Toc>

---
src: ./pages/chapter1.md
---

---
src: ./pages/chapter2.md
---

chapter1.md

---

chapter1.md 的目录

<Toc minDepth="1" maxDepth="3" mode="onlyCurrentTree"></Toc>

chapter2.md

---

chapter2.md 的目录

<Toc minDepth="1" maxDepth="3" mode="onlyCurrentTree"></Toc>