Pullquote block: alignment options differ between "classic" and "block" themes

[chthonic-ds]

Description

The alignment options for the Pullquote block are different depending on the active theme.

Step-by-step reproduction instructions

Starting with Twenty Twenty-One as the active theme:

1. Add a Pullquote block to a new page.
2. Click the Alignment icon to reveal four options are available: Align left, Align right, Wide width, and Full width.
3. Change the active theme to TT1 blocks.
4. Add a Pullquote block to a new page.
5. Click the Alignment icon to reveal two options are available: Wide width and Full width.

Expected behaviour

The Pullquote block will have the same alignment options available regardless of active theme.

Actual behaviour

Available alignment options differ depending on the active theme.

Screenshots or screen recording (optional)

Twenty Twenty-One

TT1 Blocks

WordPress information

• WordPress version: 5.8-beta1
• Gutenberg version: 10.8
• Are all plugins except Gutenberg deactivated? Yes
• Are you using a default theme (e.g. Twenty Twenty-One)? Yes, Twenty Twenty-One and TT1 Blocks

Device information

• Device: Desktop
• Operating system: Windows 10
• Browser: Chrome 91.0.4472.101

[Mamaduka]

I think this was fixed via #32810.

[chthonic-ds]

I've just tested this again, here's what I'm seeing when following the steps below (from #32810):

Add a container block with a layout define (inherit or custom both work)
See that you can align left/right blocks inside that container

With TT1 Blocks theme active, using a Group block as container block and pullquote as child block:

• Custom layout with empty/reset values: available child alignments are left and right
• Custom layout with values defined: available child alignments are wide and full width
• With "inherit default layout" active: child alignments are wide and full width

I'm still seeing the same behaviour as initially described when switching between TT1 Blocks and Twenty Twenty-One. To be clear, this happens without a container block/layout defined to wrap the Pullquote block.