From the small amount of testing I did, the splashes seem to never properly work when another entity is nearby when it hits the water. The last ravager summoned made a smaller splash than expected as well? I did test it a second time isolated from any other mods and it still happened using the latest forge version and latest version of this mod as well. Thanks for making a port btw, its tough deciding between forge and fabric.
Landing in water one block deep seems to cause the same effect as well.

try version 1.2.2

this shouldnt happen with newest versions