Changing the block settings for the initial block removes the option to add new block

[desrosj]

Description

After changing any block settings for the default paragraph block on a new post, the inline block inserter is missing.

Originally reported in Trac-53571.

Step-by-step reproduction instructions

1: Add a new post.
2: Focus on the initial block.
3: Modify any of the block setting in the toolbar on the right.
4: Observe the inline inserter is now gone.

Expected behaviour

Inline block inserter remains.

Actual behaviour

It disappears.

Screenshots or screen recording (optional)

WordPress information

• WordPress version: 5.8 RC1
• Gutenberg version: NA
• Are all plugins except Gutenberg deactivated? Yes
• Are you using a default theme (e.g. Twenty Twenty-One)? Yes

[Mamaduka]

I think this is the intended behavior. The empty block inserter is only displayed when the block is unmodified.

gutenberg/packages/block-editor/src/components/block-tools/block-popover.js

Lines 318 to 319 in e2b5503

	isEmptyDefaultBlock:
	name && isUnmodifiedDefaultBlock( { name, attributes } ),

[desrosj]

Ah interesting! Any idea why that is? I'm curious about the reasoning behind that choice.