seealso yml tag not supported in overwrite files

[glopesdev]

Operating System: Windows

DocFX Version Used: 2.59.4

Template used: default

Steps to Reproduce:

1. Create an overwrite file for some uid (e.g. apiSpec/MyNamespace_MyClass.md)
2. Specify a YML header with a seealso field:

---
uid: MyNamespace.MyClass
seealso:
- linkId: MyNamespace.MyExtendedClass
---

Expected Behavior: The output doc page for MyClass should contain a "See Also" section with a link to MyExtendedClass documentation page.

Actual Behavior: The output doc page for MyClass contains a "See Also" section but with no links.

[paulushub]

@glopesdev Nice you found this issue. Something especially wrong here, even the styling of the See Also is different.