Unable to create catalog entry - Conflict true

We are seeing this in the log. Googling comes back with a single slack entry that says post it here.

We are on Datomic Cloud Production with Query Groups. We are using Ions.

"Via": [
    {
        "Type": "clojure.lang.ExceptionInfo",
        "Message": "Server Error",
        "Data": {
            "CognitectAnomaliesCategory": "CognitectAnomaliesFault",
            "CognitectAnomaliesMessage": "Server Error",
            "DatomicAnomaliesError": {
                "Error": "Unable to create catalog entry",
                "Cause": {
                    "Conflict": true
                }
            }
        },
        "At": [
            "datomic.anomalies$throw_if_anom",
            "invokeStatic",
            "anomalies.clj",
            119
        ]
    }