Flow stopped working

I am still learning this stuff so apologies if I have done something stupid.

I have this flow: https://pastebin.com/4u121zag

It should keep the input selector in my UI in sync with the current activity on my Harmony Remote. I am sure this was working fine, was very pleased.

Yesterday I noticed the UI was not in sync, so I have gone back and done some debugging and it looks like the mustache template is not getting correctly populated. There are no errors but no values get inserted.

Input msg looks like this:

Any insights welcome.