Rheastraza not giving nest in Arena ... useless 8/8

With no duplicates in start deck I was thinking about to win my arena game, play for the nest, no nest. Whyfore Blizzard?

Are you certain there were no dublicates in your deck?

Did you have enough space on the field?

Did your opponent play Reno?

A replay would be helpful in such cases.

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There are several reasons this might have happened.

We can’t say any more, because you did not provide any details.

Apologies for the lateness, but I believe none of the conditions you mentioned happened nor did I have a duplicate. DEF no Reno played. As it never spawned to be removed. Trying to find deck information to confirm this apologies again.
UPDATED:
I can confirm a run in Arena just now - it worked as expected, getting worried may have been my fault. Looking further.

Is another possible failure of the conditions if Rheastraza did not start in your deck? (i.e. if i discovered it … could it still check the conditions to succeed?)

You’re aware that the checked condition is that your deck STARTED with no duplicates, not that it has no duplicates CURRENTLY?