X_LIVE_ROW_UNIDENTIFIED
Means
a live query returned a row with no id
Typical cause
a live: true read whose projection selects columns but not the primary key — patches, cursors and the local store all address a row by a text id — or whose id is neither text nor a safe integer (an integer key is sent as text, as the change feed sends it)
Fix
select the primary key in that query's sql(), or drop live: true from it; for an id of another type, x queries show <name> --json and project the key as text