Missing 15-19 BG

I wasn't sure if this would be classified as a bug or if it was left out on purpose, but in the v 1.9.3 r2018 Database, there is no level 15-19 Battleground defined. Region 236 (Hills Of Caret) is the 10-14 BG and 238 (Thidranki) is the 20-24 BG, but 237 (called Drizzle in the table, though it is actually Killaloe ingame) is set as the 45-50 BG.