.Page.GetPage from within a page bundle is unable to find another page if extension included in target

[jmooring]

content/
└── s1/
    ├── p1/
    │   └── index.md   <-- .Page.GetPage "p2.md" from here fails **
    └── p2.md          <-- .Page.GetPage "p1" from here works

** But .Page.GetPage "p2" (no extension) works

failing test cast

func TestFoo(t *testing.T) {
	t.Parallel()

	files := `
-- hugo.toml --
disableKinds = ['home','rss','section','sitemap','taxonomy','term']
-- content/s1/p1/index.md --
---
title: p1
layout: p1
---
-- content/s1/p2.md --
---
title: p2
layout: p2
---
-- layouts/_default/p1.html --
{{ (.GetPage "p2.md").Title }}|
-- layouts/_default/p2.html --
{{ (.GetPage "p1").Title }}|
`

	b := hugolib.Test(t, files)
	b.AssertFileContent("public/s1/p1/index.html", "p2") // failing test
	b.AssertFileContent("public/s1/p2/index.html", "p1")
}

Reference: https://discourse.gohugo.io/t/hugo-0-123-0-1-breaks-page-getpage/48403

[github-actions]

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