TOC including doesn't work at the same level

I have this file structure:
```
- toc.yaml
- toc_test.yaml
- page1.md
```

`toc.yaml`:
```
title: test
items:
- name: Test
href: ./toc_test.yaml
```

`toc_test.yaml`:
```
items:
- name: Test page
href: ./page1.md
```

And I received this error in the end:
```
ERR Link is unreachable: ./page1.md in /toc_test.yaml
```

Everything works fine if you place `sub_toc.yaml` and `page1.md` in some subfolder.