Hi Tim, thanks for the report! This was indeed a bug and should now be fixed. Can you confirm if it’s working for you now?
Basically, I think like @dougsnow said, the alternate routings are more of a regulatory requirement than anything. Real-world the flight will almost always be cleared on a different route.
SimBrief includes the SIDs because many flight planning systems I’ve seen also do this. I agree it might not make much sense, but in this case SimBrief is just copying the other systems in the interest of “realism”.
Looking at the real-world OFPs in your example, many of them do include the SID in the alternate routings. Certainly all of the LH OFPs do. Others might not depending on the flight planning software used and/or possibly airline policy.
Cheers,