Angular devtools stopped working few days ago. "Angular application not detected"

[Gertjan-Goetynck]

Is this a bug report or a feature request?

• Bug Report
• Feature Request

Please provide the steps to reproduce the issue [Bug Report only]

Try to run the dev tools on an angular project

Please provide the expected behavior vs the actual behavior you encountered [Bug Report only]

Expected behavior: See the dev tools
Actual behavior: "Angular application not detected" on apps that detected it a few days ago. No changes in app happened.

This seems to be the same bug that was active a month or so ago and was caused by a new feature in Dev Tools. The feature got rolled back as a hotfix, but now the bug returned.

Link to the previous bug: #53953 (comment)

Please provide a screenshot if possible [Bug Report only]

Please provide the exception or error you saw [Bug Report only]

Angular application not detected

Is this a browser-specific issue? If so, please specify the device, browser, and version. [Bug Report only]

No response

Description [Feature Request only]

No response

Proposed solution [Feature Request only]

No response

Alternatives considered [Feature Request only]

No response

[AleksanderBodurri]

Thanks for the report @Gertjan-Goetynck

Could you provide which version of Angular you are experiencing this issue with? Is this application using any custom build tools or just ng serve/ng build?

[JeanMeche]

Can you also double check the version of your devtools. Should be 1.0.12.

[Gustavo-Botan]

Acessei a minha aplicação pela guia anonima e deu certo, tente fazer o mesmo ou limpe o cache.
Lembre-se de configurar a extensão para habilitar em guia anonima.

[Gertjan-Goetynck]

Thanks for the report @Gertjan-Goetynck

Could you provide which version of Angular you are experiencing this issue with? Is this application using any custom build tools or just ng serve/ng build?

The angular version we are using is 11.2.10. We do an ng serve with a custom host and disabled hostcheck.

[Gertjan-Goetynck]

Can you also double check the version of your devtools. Should be 1.0.12.

Its version 1.0.12 indeed.

[AleksanderBodurri]

Thank you @Gertjan-Goetynck. I'm tracking a fix for this issue here #55233. The cause here is that Angular DevTools currently officially supports v12 and above. A recent change to how DevTools scripts get injected into applications prevented those scripts from being injected into Angular applications below version 12. The PR in question allows this script to be injected as normal for these apps again, but also implements a warning notice in those applications to inform the user that they are not on a supported version.