Ensure you are using the latest release, such as version 1.4.1 or higher, which includes critical bug fixes for broken bows and invisible mobs found in earlier 1.21 iterations.
If you are on Windows 11/10 (not console or mobile), use this community fix to get better performance:
To get the "Actions & Stuff" pack working with shaders in Minecraft Bedrock 1.21
min_engine_version to [1, 21, 0].Uno de los puntos más fuertes. El agua tiene una transparencia cristalina y reflejos sutiles que no consumen demasiados recursos.