Why not set builder->next_phase_at=InvalidTransactionId in SnapBuildRestore function?

[zxwsbg]

Hi, guys:


In PG14 or higher version, I notice that SnapBuildRestore don't 
set builder->next_phase_at=InvalidTransactionId .


But in SnapBuildSerialize function, the assert check this condition.


Assert(builder->next_phase_at == InvalidTransactionId);



I'd like to know is this right?


Thanks.