Leebo
at 2019-04-06 12:24:33 UTC
Both 勢作 and 中 (as a suffix meaning "during" or "while") have entries. The dictionary doesn't have entries for every combination of word and suffix that could possibly be put together.
Leebo
at 2019-04-06 12:26:23 UTC
IME misfire... meant 製作
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製作中 is missing
Meaning "in production".
As far as I can tell it's not a very common word, but it is verified on Google Translate.