Resource type error

[2821869675]

Godot version:
3.2.1.stable
OS/device including version:
windows 7 Ultimate X64
Issue description:
Godot cannot recognize the text file written to the content
Steps to reproduce:
In a project, create a text-type resource(TextFile) in the file system
Then write something like this:
[ { "amount": 1, }, { "path": "1/a.tscn", } ]

Save, close the project and reopen it
Godot couldn't edit it and would report errors

Minimal reproduction project:
demo.zip

[aaronfranke]

This is mostly a duplicate of #21787, though it doesn't specifically mention these exact steps, the bug is still the same. See also #24187 and #36297.