Latest .net 9 SDK breaks all of our .net 8 SDK projects

[vsfeedback]

This issue has been moved from a ticket on Developer Community.

---

[severity:I'm unable to use this version] [regression] [worked-in:17.11.*]
The latest .net 9 SDK breaks all of our .net 8 blazor projects. We're experiencing this issue:
#58948

Our developers do not have admin privileges, so they cannot install .net 8 SDK and force the use of it with global.json, and none of the workarounds in any of the github issues work for us. So we have to rollback the Visual Studio update and stay on that version until the .net 9 SDK is fixed.

---

Original Comments

Feedback Bot on 12/24/2024, 02:29 AM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

Feedback Bot on 4/8/2025, 08:08 AM:

We detected that this issue hasn’t received a lot of activity, votes, or comments in the past 90 days. Based on this, the issues severity and affected area, it’s my experience that this issue is unlikely to get fixed. To improve the situation, consider following best practices for quality problem reports, and giving us more details on how this issue is impacting you.

[dotnet-policy-service]

Hi @@vsfeedback. We have added the "Needs: Author Feedback" label to this issue, which indicates that we have an open question for you before we can take further action. This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

[dotnet-policy-service]

Thank you for filing this issue. In order for us to investigate this issue, please provide a minimal repro project that illustrates the problem without unnecessary code. Please share with us in a public GitHub repo because we cannot open ZIP attachments, and don't include any confidential content.

[dotnet-policy-service]

This issue has been automatically marked as stale because it has been marked as requiring author feedback but has not had any activity for 4 days. It will be closed if no further activity occurs within 3 days of this comment. If it is closed, feel free to comment when you are able to provide the additional information and we will re-investigate.

See our Issue Management Policies for more information.