Repair Plugin, Extension & Host Compatibility Failures

The likely issue is a contract mismatch around plugin and extension manifests, host API compatibility, activation, permissions, dependency loading, contribution registration, upgrades, sandbox boundaries, background tasks, deactivation, stale state, and crash isolation. I would first define the invariant: A plugin or extension activates only against a compatible host contract, owns every registration it creates, fails closed on missing permissions/capabilities, and releases state cleanly on disable, upgrade, or host shutdown. Then I would trace the smallest owning boundary, keep VERIFIED facts separate from LIKELY/UNKNOWN state, apply or propose the narrowest repair, and add deterministic normal, boundary, failure, retry/cancellation, and recovery tests. The workflow preserves authorization, privacy, security policy, public interfaces, user-visible behavior, and documented ownership. With repository/workspace access, findings can map to exact paths and focused local validation; with partial evidence, the result remains an explicit diagnosis/evidence map with no invented execution claims.