Hello @Kåre Harder Olesen,
Welcome to Microsoft Q&A forum.
Please try following:
- If you can right-click your project in the solution explorer, then please right-click it, reload Project.
- Try to remove project cache by closing VS, removing the hidden .vs folder in the solution folder and reopen your project.
- Try to update the SSIS extension, if it’s already the latest version, then please try to uninstall and reinstall it.
- Try to reset VS settings by running
devenv /ResetSettings
in Developer Command Prompt for Visual Studio 2019 Professional.
Best Regards,
Tianyu
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