With the update to Drupal 9.51 contents of prototype.info.yml need to be updated, otherwise they get "lost" and can't be found
.
name: prototype
type: theme
description: Prototype Sub-Theme
package: prototype
core_version_requirement: ^8.8 || ^9
base theme: stable

regions:
header: Header
primary_menu: Primary Menu
secondary_menu: Secondary Menu
highlighted: Highlighted
help: Help
content: Content
sidebar_first: First Sidebar
sidebar_second: Second Sidebar
footer: Footer
breadcrumb: Breadcrumb

libraries:
- prototype/global

components:
namespaces:
prototype-components:
- libraries/components ----- THIS IS THE LINE THAT NEEDS TO CHANGE!
prototype-icons:
- images/icons

Issue fork prototype-3332059

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jayvolk created an issue. See original summary.

jldust made their first commit to this issue’s fork.

jldust opened merge request !12

  • jldust committed 15ebbd47 on 4.x 
    Issue #3332059 by jldust, jayvolk: Need to change prototype.info.yml for...
jldust’s picture

jldust commented
Status: Needs review » Fixed

Thanks for catching this, I've updated the pathing in the .info file.

jldust’s picture

jldust commented
Status: Fixed » Closed (fixed)

This has been included in the 4.0.0-alpha2 release, thanks again!