explorer: verify cached objects are properly mainted during execution

We've started caching data for the plugin. Let's ensure these caches are properly maintained during execution e.g. caches are cleared when program rebase occurs.

Start by tracing the explorer plugin's cache lifecycle during execution, especially where program rebases are handled. Verify that cached objects are invalidated or refreshed after a rebase and that execution continues with consistent cache state.

Written by the indexing model from the issue text.