Ravagers float above flowing water without being pushed unless they sink further down into the water. This leads to them getting stuck under 3 high blocks. 

Image pictured is not jumping, But consistently floating.
Also noted that the ravager is not directly over the source block.
The source block is further behind him. 

Intended behavior:
If the Ravager is in the flowing water, It should be pushed and not have a visible air gap between the ravager and flowing water.