Set Parent Group block alignment while editing Template Part

[richtabor]

Is there an existing issue for this?

• I have searched the existing issues

Have you tried deactivating all plugins except Gutenberg?

• I have tested with all plugins deactivated.

Have you tried replicating the bug using a default theme e.g. Twenty Twenty?

• I have tested with a default theme.

Description

I should be able to modify a parent group block's alignment width setting (wide/full) when editing a template part in a template part's editor view within the Site Editor.

When applying a background color in the template part editor view, it seems the group block is 100%— but here's what we get instead:

So I went to ensure it was set to alignfulll, but the template editor view would not allow it. However, I could go into the standard Site Editor view (editing the singular template for example) and I was able to properly set the width to alignfull.

Step-by-step reproduction instructions

1. Go to a template part within the Site Editor
2. Attempt to set wide/full width (not possible as the Group block's controls are missing)
3. Go to a template part on a template, such as Singular
4. Attempt to set wide/full width (possible).

Expected Behavior

I can set alignfull/alignwide while editing a specific template part.

Current Behavior

The align controls are missing (wide/full) when viewing a template part within its own edit view.

Screenshots or screen recording (optional)

Editing a template part within the Site Editor > Singular template (works):

Editing a template part on its own view:

Code snippet (optional)

No response

WordPress Information

5.8

Gutenberg Information

11.2.1

What browsers are you seeing the problem on?

No response

Device Information

No response

Operating System Information

No response

[DaisyOlsen]

I've run into this issue and wondered if it was intentional or not. From a theme development standpoint the ability to set full and contained widths via the site editor feels pretty important.

[MadtownLems]

The inability to use Full-Width blocks in Template Parts is causing some headaches for us and our hybrid theme.

A simple use case is that we have a Template Part above the primary post listing. We absolutely want folks to be able to use full width blocks here, but it seems impossible.

[MadtownLems]

I'm attaching an example of what we're trying to do, which seems impossible due to #30079