Taking time to investigate, "Why some players may have not gotten Solo Battle rewards."
Let me save you some time. Your new bungled (excuse me bundled) rewards did not test for challenge rewards that include a choice between coins or packs (that would be solo battles). Bundled rewards attempted to bundle those rewards and couldn't do it. Voilà solo battle rewards crashed.
Taking time to investigate, "Why some players may have not gotten Solo Battle rewards."
Let me save you some time. Your new bungled (excuse me bundled) rewards did not test for challenge rewards that include a choice between coins or packs (that would be solo battles). Bundled rewards attempted to bundle those rewards and couldn't do it. Voilà solo battle rewards crashed.
Programming 101. Test all conditions.