Paw-app Checkbox Dynamic value always returns false

I'm using the JsonWebTokenDynamicValue extension http://ift.tt/2bJ6nY3

When I first installed/used the extension with the Add Time Fields checkbox checked, everything worked as expected. Now (possibly after the first restart of the app?), checking the checkbox field appears to do nothing. It is always evaluating to false.

I went to the effort of downloading the source and adding some logging to verify what I was seeing. Screenshot showing the box checked and the resulting value still being false

The other checkbox on this extension Secret is Base64 is also misbehaving in the same way (always false).

Any ideas?