Charles fixed this for me, with a new property set. I can't attach the property set for you to import, so it's in a code chunk below. This works great because the parameters are in the property set and do not need to be set in the snippet call at all.
And here's the output from the property set (copy and paste, save as filename.js, then import to a new property set in the mxCalendar snippet). Make sure to adjust the properties to your settings. i.e. chunk names, IDs, etc.:
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