Apparently, the correct pitch accent of 問題なだけなのだ is: もんだいな{HHHHH} ・
だけなのだ{LHLLL} (two accent phrases)

I don't understand why だけ creates a new accent phrase here (I don't think it
usually does) and why there is a drop after だけ. I would like to learn the more
general rules that explain the pitch behavior of なだけなのだ in this phrase.
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2023-06-19T17:05:32.857
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2023-06-19T17:05:32.857
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question
pitch-accent
Pitch accent of 問題なだけなのだ