When switching between visionOS SwiftUI previews in Xcode 26, the Canvas can momentarily stop with a “Resource Invalidation” message. Apple documents this behavior as a known Xcode 26 issue (158613019) and recommends resuming the preview as the workaround.
Error message
Resource InvalidationThe message can appear momentarily while moving between visionOS previews.
Cause
According to the Xcode 26 Release Notes, this is a known issue that can occur when switching between visionOS previews. The message therefore does not, by itself, prove that your Swift code is invalid or that the project has a build configuration problem.
Affected environment: visionOS Previews in Xcode 26. Apple tracks the issue as 158613019. The public release note does not identify a specific Xcode version in which this issue is fixed, so it would be inaccurate to claim that upgrading to a particular version is a confirmed fix.
Recommended workaround
- Click Resume in the Canvas.
- Alternatively, press
Command + Option + P. - Wait for the preview to rebuild and confirm that the “Resource Invalidation” message disappears.
This is the workaround Apple explicitly provides in the Xcode 26 Release Notes.
Alternative troubleshooting
If Resume does not recover the preview and the same failure persists, another problem may be present in addition to the known transient issue. Open the Preview diagnostics and check for a separate build error, package-resolution failure, linker error, or other diagnostic that provides a more specific cause.
Apple’s documented workaround for this particular issue is simply to resume the preview. There is no basis in the cited release note for treating DerivedData deletion, package-cache deletion, or an Xcode reinstall as required steps solely because “Resource Invalidation” appeared.
How to verify the fix
- Switch between visionOS previews.
- If “Resource Invalidation” appears, click Resume or press
Command + Option + P. - If the Canvas resumes normally, the behavior is consistent with Apple’s documented known issue.
Important notes
Do not assume every Preview failure containing “Resource Invalidation” has the same root cause. If the Canvas continues to fail after Resume, inspect the additional Preview diagnostics and troubleshoot the more specific error shown there.
Summary
A momentary “Resource Invalidation” error while switching visionOS previews in Xcode 26 is a known Apple-documented issue. The recommended workaround is to resume the Canvas, either with the Resume button or Command + Option + P. Until Apple identifies a fixed version in its public notes, avoid presenting an unverified Xcode update as a guaranteed fix.
Official references
- Apple: Xcode 26 Release Notes — Previews Known Issues, issue 158613019
- Apple: Previews in Xcode
