Split Stays
In February 2019, FP booking windows for split stays changed significantly. Back-to-back onsite stays no longer allow FPs to be booked earlier than normal for the second stay. You can now only book 60 days ahead of check-in day for each stay (for length of that stay) separately.
ETA March 28, 2019: The FP and split stay situation continues to evolve, check recent posts in this thread for the most up-to-date information. When the dust settles, I’ll update this post as appropriate.