OK, I did that and they did autofill.
I also realized that I need to put these new tags into the "Set Displayed Fields", which I did. For the Work [full] and Work [adapt], what appears is the script.
For Work [top] and Work [ sub ], there's nothing. This is true for all the music in my library, even the ones which I didn't run through Picard.
And, for Picard title full (the custom tag label), it just says that; and it says that only for the one file I ran through Picard.