Unable to Collect Seedling From Event Challenge After Managing Seedling Storage

I received a seedling from the Event Challenge, but couldn’t claim it because my seedling storage was full. After discarding one seedling and planting another, I now have two open slots. However, I am still unable to collect the seedling.

I’ve restarted the app multiple times, but the issue persists. I am also using the most recent version of Pikmin Bloom available in the Apple App Store.

Do you have any seedlings while expedition?