As you can see in the picture dupe is using shower but not consume any water. Water in the pipe is not flow and source of water is blocked using empty bridge down below. Pipe is connected to liquid tank earlier but I notice no polluted water came out so I check it and took pipe off and put bridge instead.
Save file: Factorio.sav
Steps to Reproduce
Nothing just load the save you will see it.
This issue has been fixed in either a future version or updated in a previous version.