[BUG] Any Single Type shows 404 endless load spin in Content Manager in version 4.24.1

[b0tm1nd]

Bug report

Required System information

• Node.js version: v20.12.2
• NPM version: 10.5.0
• Strapi version: 4.24.1
• Database: SQLite
• Operating system: Ubuntu 22.04
• Is your project Javascript or Typescript:

Describe the bug

Any kind of Single type creation or change from Collection type leads to a blank right side with a loading spin.
In Dev console a request to
/content-manager/single-types/api::test.test/
gives a 404 not found response

Steps to reproduce the

1. yarn create strapi-app my-project
2. Create an admin user and a Single type content
3. Go to content manager for the created type and get an endless load

Expected behaviour

Expected to see Content manager capable listing/editing entries.

Screenshots

Screenshots attached

[b0tm1nd]

Looks like a very essential bug. Isn't that anyone else experiencing it?

It appears that any requests under
http://server:1337/content-manager/single-types/ return 404 not found error, when for collection types a request for
http://server:1337/content-manager/content-types/ returns all the created types.

[strapi-bot]

This issue has been mentioned on Strapi Community Forum. There might be relevant details there:

https://forum.strapi.io/t/typeerror-modeltype-is-undefined/38160/5

[b0tm1nd]

Workaround:
Edit file /node_modules/@strapi/plugin-content-manager/dist/server/index.js line around 160:

      method: "GET",
      path: "/single-types/:model",
      handler: "single-types.find",

change to

      method: "GET",
      path: "/single-types/:model",
      handler: "collection-types.find",

Then all the single collection types will become visible. Fill with data at least one field of a single type you created and save. After that revert the changes and it will stay visible.

Conclusion:
Possible bug in finding empty single types in find() function of :
@strapi/strapi/dist/core-api/service/single-type.js
@strapi/strapi/dist/core-api/controller/single-type.js

[strapi-bot]

This issue has been mentioned on Strapi Community Forum. There might be relevant details there:

https://forum.strapi.io/t/single-type-blank-page/36085/3

[b0tm1nd]

Problem persists in v5.12.4
Confirmed solution from the above forum post with the except that the target file now is /node_modules/@strapi/content-manager/dist/server/routes/admin.js