Update to 25.2 Breaks AI Skill Smart Service?

Yesterday I was able to create, save and publish Process Models with an AI Skill.  Today, after the environment I was working in was updated to version 25.2, I am unable to publish Process Models containing an AI Skill smart service.  

Any attempt to save results in the following error: "Parameter Input Text on Activity Class Execute Generative AI Skill on node Blinken Lights! requires a value..."

A process variable is correctly set on the Data tab.  The data type of the variable is correct.  I've tried changing the variable, using a literal value, rebuilding the node, etc.  

Anyone else experiencing this?  What am I doing wrong?