Minecraft wiki entry for Update_Aquatic, associated text: 1.4.1 was released exclusively on Android and Fire OS to fix a bug involving players losing previously purchased items.
1.4.2 fixed several crash-related bugs.
1.4.3 was released exclusively on iOS devices to fix some bugs and added a new map by Blockceptions.
1.4.4 was released exclusively on Android and Fire OS to fix a bug that had issues with telemetry.