Practical guide
When a saved product link changes
The original listing and an outgoing agent destination are separate pieces of evidence.
Keep the original listing
Retain its exact detail URL so you can identify what was originally saved.
Recheck the destination
A homepage, login screen or generic search result is not confirmation of a matching product page.
Treat stale entries clearly
If the listing disappears, keep a labelled unavailable entry only when it helps explain an existing shortlist; disable the outgoing action.
Independent note: This guide is general research support, not agent, legal, customs or authentication advice.