Single product templates that have been edited by the merchant can't be selected in the edit product screen

[Aljullu]

This issue might require changes in WC core or Gutenberg repos, but I'm creating this in WC Blocks repo for ease of tracking it.

To reproduce

1. In Twenty Twenty Two, create a new template, ie: /themes/twentytwentytwo/templates/another-single-product.html

<!-- wp:template-part {"slug":"header"} /-->
<!-- wp:group {"layout":{"inherit":true}} -->
<div class="wp-block-group"><!-- wp:woocommerce/legacy-template {"template":"single-product"} /--></div>
<!-- /wp:group -->
<!-- wp:template-part {"slug":"footer"} /-->

2. Add it to customTemplates in theme.json:

{
	"version": 2,
	"customTemplates": [
		...
		{
			"name": "another-single-product",
			"title": "Another Single Product Template",
			"postTypes": [
				"product"
			]
		}
	],
	...
}

3. Go to WooCommerce > Products and edit one of the products.
4. Notice you can select between the default template and Another Single Product Template.

5. Go to Appearance > Editor > Templates > Another Single Product Template, make an edit and save the edited template.
6. Now, go back to editing a product.
7. Notice Another Single Product Template is no longer listed as an available template.

Expected behavior

If the merchant makes an edit to a template that has postTypes: [ 'product' ], it should still be available when editing or creating products.

More info

I think the issue comes from the fact that WC uses get_block_template(), which internally calls _build_block_template_result_from_post(). And the latter, doesn't add a post_types attribute to templates returned.

[Aljullu]

I created an issue in trac, I think that should ideally be fixed upstream:

https://core.trac.wordpress.org/ticket/55881#ticket

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[tjcafferkey]

Can confirm this has been fixed.