I have some third-part library, templates from that library is diplayed by default.

I want to replace layout template, from which all other start inheritance.

So, in my local app I create new layout.html file, which contents {% extends 'library:layout.html' %}

But in that case I've got TemplateDoesNotExist at /test-url/ test.html

But still Template-loader postmortem display, that it can find file:

Django tried loading these templates, in this order:
Using loader django.template.loaders.filesystem.Loader:
/path/to/app/templates/test.html (File does not exist)

Using loader django.template.loaders.app_directories.Loader:
/path/to/library/app1/templates/test.html (File does not exist)
/path/to/library/app2/templates/test.html (File does not exist)
/path/to/library/app3/templates/test.html (File exists)

So, in library app3 Django found template, but for some reason do not use it. Can you help with this issue?

Thanks.