If the attribute says "encapsulate this", dropping just the attribute will create a blackhole as you will attract traffic that should be encapsulated and packets following this route will be dropped it if not.
Yes, but then again since you have logs of why it was dropped (like I suggested in my first post, to log everything dropped), you can easily troubleshoot the problem. A much better outcome than flapping a BGP session for no good reason and creating route churn and network instability.
