Yes, wanting to confirm this as I experienced it and submitted a ticket. Left with nothing but an AI response.
I had x10 Radiant Echo(es) and used x5 twice this morning.
I believe I have received an insufficient amount of Coffer Key Shards, as I completed one Worldsoul Memory, achieving above 500 memory points and received an insufficient amount(under 40 iirc?) whilst on my second Worldsoul Memory, I achieved under 500 memory points but received 179 Coffer Key Shards.
I was just about to post this thread too. Glad, but also not glad somebody has experienced this.