In that case, its a bit more than a pusaka, it is something that up until the rule of PBII was considered to be essential to legitimse the position of the Susuhunan in Kartasura, in the event it turned out that PBII was able to hold his position in the absence of this type of pusaka, but there are still people in Jawa at the present time who tie the reign to the pusakas.
You have outlined a situation, but there are multiple elements involved, and what actually happened in such a situation would depend upon a measured judgement in respect of all elements and all possible results.
There is never any set in stone answer, and in most things Javanese the same thing applies.
But setting that aside, some things that can happen are that an old blade can be incorporated into a new blade, or even parts into several new blades.
The keris could be thrown into a river or a rice field, or the sea, or it might simply be stored as it is in quiet situation, in effect, retired from active service, so to speak.
In the final analysis there is no answer to your question, because there are multiple situations, multiple people involved, and multiple possibilities.
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