Relation between rounds eras and validation set eras

In last validation file there are five eras (1046 - 1050) without targets.
Respect previous validation file, targets of era 1045 have been added.
Which round correspond to 1045 era? 399 (the last resolved)? or there is a delay of a week before target data are added to validation set?
What confund me is there are five (not four) eras in validation set without target.

see here

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