Apologies for all the comments! When I initially posted them it said they failed to upload, which is why I created a new reply.

When a partial install occurs it can cause mismatched bundles across Xcode and /Library/Developer. I tried all of the following, after researching the issue for some time, xcrun devicectl manage ddis update, reinstalling XcodeSystemResources_Full.pkg, xcode-select, CLTs, clearing caches/DerivedData, deleting DDIs, resetting simulators. None worked, still got "Failed to find a DDI". Only a full removal of Xcode and reinstall fixed it.

When a partial install occurs it can cause mismatched bundles across Xcode and /Library/Developer. I tried all of the following, after taking the issue to AI, xcrun devicectl manage ddis update, reinstalling XcodeSystemResources_Full.pkg, xcode-select, CLTs, clearing caches/DerivedData, deleting DDIs, resetting simulators. None worked, still got "Failed to find a DDI". Only a full removal of Xcode and reinstall fixed it.

When a partial install occurs it can cause mismatched bundles across Xcode and /Library/Developer. I tried all of the following, after taking the issue to AI, xcrun devicectl manage ddis update, reinstalling XcodeSystemResources_Full.pkg, xcode-select, CLTs, clearing caches/DerivedData, deleting DDIs, resetting simulators. None worked, still got "Failed to find a DDI". Only a full removal of Xcode and reinstall fixed it.

I have to disagree. When a partial install occurs it can cause mismatched bundles across Xcode and /Library/Developer. I tried all of the following, after taking the issue to AI, xcrun devicectl manage ddis update, reinstalling XcodeSystemResources_Full.pkg, xcode-select CLTs, clearing caches/DerivedData, deleting DDIs, resetting simulators. None worked, still got "Failed to find a DDI". Only a full remove of Xcode and reinstall fixed it.