Uncaught Type Error: array_key_exists(): Argument #2 ($array) must be of type array, null given

[bobbingwide]

While trying to implement a custom page template that supports the display of a full width image, I played around with adding "layout": {"inherit":true} to the post title block, inside a group block that had "align": "full".
The intention was to have the post title with normal alignment.

This was in the template part post-content.html being called from the template single-full.html.

<!-- wp:template-part {"slug":"post-content","theme":"fizzie", "className": "post-content", "align":"full","layout":{"inherit":true} } /-->

post-content.html was:

<!-- wp:group {"className":"post","backgroundColor":"background","align":"full"} -->
<div class="wp-block-group post has-background-background-color has-background alignfull">
    <!-- wp:post-title { "layout":{"inherit":true} }/-->

<!-- wp:post-content /-->

<!-- wp:post-tags /-->

<!-- wp:post-hierarchical-terms {"term":"category"} /--></div>
<!-- /wp:group -->

All of the above was created by hand, not using the Site Editor nor the block editor for Templates or Template Parts.
Gutenberg 10.3.1

I was surprised to see the Fatal error:

Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, null given in C:\apache\htdocs\wordpress\wp-content\plugins\gutenberg\lib\block-supports\align.php:48 
Stack trace: 
#0 C:\apache\htdocs\wp-a2z\wp-includes\class-wp-block-supports.php(113): gutenberg_apply_alignment_support(Object(WP_Block_Type), NULL) 
#1 C:\apache\htdocs\wp-a2z\wp-includes\class-wp-block-supports.php(171): WP_Block_Supports->apply_block_supports() 
#2 C:\apache\htdocs\wordpress\wp-content\plugins\gutenberg\build\block-library\blocks\post-title.php(34): get_block_wrapper_attributes(Array) 
#3 C:\apache\htdocs\wordpress\wp-content\plugins\gutenberg\lib\compat.php(136): gutenberg_render_block_core_post_title(Array, '', Object(WP_Block)) 
#4 C:\apache\htdocs\wp-a2z\wp-includes\class-wp-block.php(221): {closure}(Array, '', Object(WP_Block)) 
#5 C:\apache\htdocs\wp-a2z\wp-includes\class-wp-block.php(211): WP_Block->render() 
#6 C:\apache\htdocs\wp-a2z\wp-includes\blocks.php(799): WP_Block->render() 
#7 C:\apache\htdocs\wp-a2z\wp-includes\blocks.php(837): render_block(Array) 
#8 C:\apache\htdocs\wordpress\wp-content\plugins\gutenberg\build\block-library\blocks\template-part.php(100): do_blocks('<!-- wp:group {...') 
#9 C:\apache\htdocs\wordpress\wp-content\plugins\gutenberg\lib\compat.php(136): gutenberg_render_block_core_template_part(Array, '', Object(WP_Block)) 
#10 C:\apache\htdocs\wp-a2z\wp-includes\class-wp-block.php(221): {closure}(Array, '', Object(WP_Block)) 
#11 C:\apache\htdocs\wp-a2z\wp-includes\blocks.php(799): WP_Block->render() 
#12 C:\apache\htdocs\wp-a2z\wp-includes\blocks.php(837): render_block(Array) 
#13 C:\apache\htdocs\wordpress\wp-content\plugins\gutenberg\lib\full-site-editing\template-loader.php(192): do_blocks('<!-- wp:html --...') 
#14 C:\apache\htdocs\wordpress\wp-content\plugins\gutenberg\lib\template-canvas.php(12): gutenberg_get_the_template_html() 
#15 C:\apache\htdocs\wp-a2z\wp-includes\template-loader.php(106): include('C:\\apache\\htdoc...') 
#16 C:\apache\htdocs\wp-a2z\wp-blog-header.php(19): require_once('C:\\apache\\htdoc...') 
#17 C:\apache\htdocs\wp-a2z\index.php(17): require('C:\\apache\\htdoc...') 
#18 {main} thrown in C:\apache\htdocs\wordpress\wp-content\plugins\gutenberg\lib\block-supports\align.php on line 48

[bobbingwide]

I found other combinations of attributes that cause the Fatal Error. eg {"fred":{""} }.
I didn't investigate further than to confirm what the stack trace already told me
that NULL was being passed as the second parameter to gutenberg_apply_alignment_support().

[bobbingwide]

Looks like this was fixed for #82