After several game days the mob cap will be filled up by Drowned as they will spawn in 2 or 3 deep water near to surface and even during the day as light levels are lower than 7, as they are underwater they will not die due to sunlight, also if the pools have any sort of covering then you will get them spawning as cave spawns too so its not unusual to find a small pool of 16 or even more Drowned and no monsters anywhere else in the local area. This is especially bad in oceans and swamps that have a lot of water. I have noticed Slimes are rarely spawning in swamps now as the Drowned are filling up the density cap by spawning in nearby water, making it very frustrating to try get smileballs.
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[Mojang] Mega_Spud (Jay)
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-21856.
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Though I can see this could be considered a duplicate of the overall mop cap limits, this could be fixed very simply in the same way as ghasts in the nether or surface creepers have a fixed limit thus other types of mobs could be spawned in the same density area. Previously mobs could not spawn in water but now with the Drowned they can so it has drastically changed how the game runs on the long term and how mobs will appear. Setting the density cap to 2 Drowned surface spawns and possibly 4 cave spans would instantly solve the issue that has occured that is specific to the latest builds and not to older versions. The other idea that having a slider to increase mob cap would not help as instead of 16 Drowned you will end up with 100 Drowned all in the same place.