We discovered that filters containing only linkedIssuesOf without any other Enhanced Search functions were not syncing following a region migration. These filters could still be synced manually, and they displayed the correct results when performing a search in the UI. If any affected filters had their JQL or name updated, they resumed syncing as usual.
All other filters, including those containing linkedIssuesOf alongside other Enhanced Search functions, continued syncing correctly after a region migration.
For example: This filter containing only linkedIssuesOf was not syncing: issueFunction in linkedIssuesOf("issue=ES1") But this filter containing linkedIssuesOf and another Enhanced Search function was syncing: issueFunction in linkedIssuesOf("issue=ES1") and issueFunction in childrenOf("project=Enhanced-Search") We have corrected this issue, and any affected filters should now be syncing correctly. No further action is required.