Since the launch of the new expansion, cards that were wild, or rotated to wild, which had Diamond version, have lost the ability to keep the diamond version in Standard.
There’s been 2 patches since the launch of the expansion. We saw a mini patch a week ago, and then this most recent patch that came out yesterday, neither has of them have addressed the issue.
Not very happy about this, considering the investment that is required in order to complete the collection for an expansion.
Hopefully this will be resolved soon so we can start using what we have earned to have in our collections.