I see; it looks like in some cases that mod will add a Fluid to the Empty Space tile; I did not see that actually happen, but I could see how it could happen in the code. That conflicts with logic within this mod that gives one specific type of item for Empty Space (to workaround bugs within Factorio itself), but another similar one for all Fluid-based tiles.
It's not a good overlap. But, I've already been reworking how this occurs, so this bug will also disappear after some upcoming updates.