I have a feeling he may have a make toys task in the future, further into the quest line. I had the same thing happening with squeaky voice teen, and as I progressed, now he can "Make Piggy Banks"
Glad I found this thread! Same thing as OP is happening to me. Explanation makes sense. Will see what happens when Lisa finishes this round of Make Musical Instruments, and I have Frink, Moleman and SVT in there as well. They've been in there multiple times each, but I guess those times didn't give credit for the ten needed since they finished before the task came up.
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