Extending a blueprint causes fatal error

[OleVik]

Expected Behavior
A user can extend a plugin's blueprints if the plugin has enabled this behavior.

Actual Behavior
After using extends@ with the expected structure, the server refuses to restart.

Specifications
Grav v1.7.49.1 + Admin v1.10.49, Windows 10 x64, PHP v8.2.29 x64

Steps to Reproduce the Problem
Repository with file differences

1. Downloaded Grav v1.7.49.1 + Admin v1.10.49 and unzipped it
2. Ran php bin/grav server using PHP v8.2.29, and created an Admin-user
3. Added public $features = ['blueprints' => 10,]; in user/plugins/markdown-notices/markdown-notices.php per #1804
4. Modified user/plugins/markdown-notices/blueprints.yaml to import properties:

form:
  validation: strict
  import@:
    type: options
    context: blueprints://plugins/markdown-notices

5. Added user/plugins/markdown-notices/blueprints/plugins/markdown-notices/options.yaml with the original fields:

form:
  fields:
    enabled:
      type: toggle
      label: PLUGIN_ADMIN.PLUGIN_STATUS
      highlight: 1
      default: 0
      options:
        1: PLUGIN_ADMIN.ENABLED
        0: PLUGIN_ADMIN.DISABLED
      validate:
        type: bool

    built_in_css:
      type: toggle
      label: PLUGIN_MARKDOWN_NOTICES.USE_BUILT_IN_CSS
      highlight: 1
      default: 1
      options:
        1: PLUGIN_ADMIN.ENABLED
        0: PLUGIN_ADMIN.DISABLED
      validate:
        type: bool

    base_classes:
      type: selectize
      label: PLUGIN_MARKDOWN_NOTICES.BASE_CLASSES
      size: large
      placeholder: PLUGIN_MARKDOWN_NOTICES.BASE_CLASSES_PLACEHOLDER
      help: PLUGIN_MARKDOWN_NOTICES.BASE_CLASSES_HELP
      classes: fancy
      validate:
        type: string

    level_classes:
      type: selectize
      label: PLUGIN_MARKDOWN_NOTICES.LEVEL_CLASSES
      size: large
      placeholder: PLUGIN_MARKDOWN_NOTICES.LEVEL_CLASSES_PLACEHOLDER
      help: PLUGIN_MARKDOWN_NOTICES.LEVEL_CLASSES_HELP
      classes: fancy
      validate:
        type: commalist

6. Cleared cache with php bin/grav clearcache, restarted server, and forced browser refresh
7. Options show up as expected, and persist without error past a cleared cache
8. Added user/blueprints/markdown-notices/options.yaml to override a property of a field by extending the base type:

extends@:
  type: options
  context: blueprints://plugins/markdown-notices

form:
  fields:
    enabled:
      label: Modified label

9. Verified that the label shows the changed text
10. Stopped server and cleared cache
11. Trying to start server again now results in a fatal error:

PHP Fatal error:  Allowed memory size of 134217728 bytes exhausted (tried to allocate 262144 bytes) in ...\grav-admin-blueprints-crash\vendor\rockettheme\toolbox\ResourceLocator\src\UniformResourceLocator.php on line 271

Referring to this line in RocketTheme/Toolbox, which contains

$uri = (string)preg_replace('|\\\\|u', '/', $uri);