SYMPTOM:
In Strategy Web 9.4.1, a bubble grid in a Visual Insight Dashboard does not display the metric value in the tooltip when the metric that is in the Color by section has the value 0, like shown below.

STEPS TO REPRODUCE:
Follow these steps to reproduce in a Strategy Tutorial project:

The issue happens with datasets coming from the Data Warehouse as well.
CAUSE:
This is a known issue in Strategy Web 9.4.1.
ACTION:
This issue is addressed in Strategy Web 10.0. Upgrade to this or a later version to take advantage of the fix.