Node edit page template not applying when using Gin admin theme

Problem/Motivation

The node edit page template provided by Gutenberg module is not being applied when using Gin admin theme.

Steps to reproduce

Enable Gutenberg and set the Gutenberg experience on any content type, set Gin as default admin theme, go to node edit.
One of the side effects is that the loading spinner is not available which makes the node edit page loading a bit quirky - shows the default form, hides it and the shows the proper Gutenberg edit page.

Proposed resolution

It seems that the module is not properly defining the page template suggestions at https://git.drupalcode.org/project/gutenberg/-/blob/8.x-2.x/gutenberg.mo...