TSB have its own weakness especially against Senjutsu attack.
Example:-
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It can be break if the attack had enough power to break it and supported with Senjutsu chakra. Like in the picture, bcus Madara is senjutsu user, TSB get weaken in defensive capability bcus of Senjutsu on Madara's body plus the strength and force of Guy's evening elephant punch.
It coudnt negate Senjutsu base aspects easily.
-little crack on TSB after getting hit by Senjutsu Rasengan
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-Toad oil attack on TSB
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About what happen on Sword of Nunobuko
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Read the rest here:-
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-Nunobuko Sword of Hagoromo
work on deep feeling and believe. If the person who used it have a slightest doubt inside his self and mind as shown by Obito here, the sword power is being halt or becoming weak bcus of self doubt/uneasy happen inside user mind.
Its not bcus Sasuke's Susanoo sword is stronger than it that the sword broke, no.
Its bcus user(Obito) feeling.
Sword of Nunobuko is the second strongest TSB manipulation after Massive TSB.