Avaricious Dragon+Silver Strike

Ithilglin

I have Starfield of Nyx+Silver strike on board, my opponent have Avaricious dragon.
Avaricious Dragon destroy the silver strike gem when attacking and it comes back the next turn because of Nyx.
And Avaricious Dragon destroys it again...

And again

And again

Each turn one of the three gems destroyed by Avaricious Dragon is the silver strike one even if there is plenty of gems of my colors .

May be it was just a bad luck series but it could be a bug so I report it to check if anyone faced the same problem or on the contrary managed to destroy Avaricious Dragon with silver strike.