James Burleigh

I've just setup a dedicated 1.9.0.15 server alpha (because i wasn't happy with the realms performance and we had this issue with drowned and dolphins building up and lagging everyone out) and have written my own automated server management in powershell redirecting standard input and output to; keep it running, save and create backups to an external disk, check for updates, auto update with graceful shutdown and restart, post system logs and interesting statuses to discord about things like the in game time, moon phase, players online, weather etc and one of my players mentioned including drowned as part of the weather report,
so i ran a /testfor @e, cut and shut the results to view the mob count stats and the drowned count is more than double that of any other mob, so for anyone interested, here's our top 10 mob counts after a week of running the 1.9 dedicated windows server making best efforts to not leave a fully zoomed out map area around spawn:

Drowned-328
Skeleton-157
Creeper-92
Spider-89
Chicken-78 (we've automated cooked chicken)
Minecart with Chest-58 (spawn is on top of a giant mineshaft)
Zombie-25
Bat-24
Pig-24
Llama-21

pretty sure from this data i'm just going to schedule purging drowned once an hour until this issue is really fixed

/kill @e[type=drowned]

Can confirm this is still occurring on all platforms running bedrock 1.5.3, tested on ios, pc, xbox, android. Hurry up Mojang! in the time since this bug report has been open with an iron farm above an iron farm at each cardinal direction of an active area i could have generated 1938522 ingots by now!