Does not doing something mustahabb mean falling into makrooh?

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Check below answers in case you are looking for other related questions:
If consensus has been reached, it is not permissible for anyone differ from it
Can hadeeth abrogate or make specific the general meaning of verses of the Holy Qur’an?

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Rulings on ijtihaad in Islam and the conditions to be met by the mujtahid
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Is it permissible to speak words of disbelief in order to save one’s life? Which is preferable, to be patient or to utter such words?
If consensus has been reached, it is not permissible for anyone differ from it
Can hadeeth abrogate or make specific the general meaning of verses of the Holy Qur’an?

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