Handle corner case in iterated variable processing When processing deferred iterated variables, if the variable maps to another Var that also has no projection, the second variable would be added to iterated_vars but not processed (since we're already iterating). Fix: Reset iterated_vars before processing, then check if any new variables were added during iteration - these indicate broken projection chains and should raise an error. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>