Fragmented IPv6 packets

I have a question on IPv6 fragments.  Since IPv6 mandates a minimum MTU
of 1280,  IPv6 fragments (except the last fragment) should be of minimum
1280 bytes right? When an end host receives an IPv6 fragment which is
lesser than 1280 bytes ( except the last fragment ) , should it treat it
as invalid and drop it or should it still consider the fragment for
reassembly. Are there any IPv6 implementations which reassemble them?

Thanks,
Muthu

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