Updates to pass raster tests

holoviews/operation/datashader.py

@@ -403,7 +403,7 @@ def _process(self, element, key=None):
             agg[y.name] = agg[y.name].astype('datetime64[ns]')
 
         if isinstance(agg, xr.Dataset) or agg.ndim == 2:
-            # Replacing x and y coordinates to avoid numerical precision issues
+            agg.attrs["rasterized"] = True  # Setting this so we know data has been rasterized
             return self.p.element_type(agg, **params)
         else:
             params['vdims'] = list(map(str, agg.coords[agg_fn.column].data))

holoviews/plotting/bokeh/raster.py

@@ -8,6 +8,7 @@
 from bokeh.models import CustomJS, CustomJSHover, DatetimeAxis, HoverTool
 from bokeh.models.dom import Div, Span, Styles, ValueOf
 
+from ...core.data import XArrayInterface
 from ...core.util import cartesian_product, dimension_sanitizer, isfinite
 from ...element import Raster
 from ..util import categorical_legend
@@ -65,10 +66,12 @@ def _init_tools(self, element, callbacks=None):
             if isinstance(tool, HoverTool):
                 hover = tool
                 break
-        if hover is None:
-            return tools
 
         data = element.data
+
+        if hover is None or not (XArrayInterface.applies(data) and "rasterized" in data.attrs):
+            return tools
+
         coords, vars = tuple(data.coords), tuple(data.data_vars)
         dims = (*coords, *vars)