Hello,
we have an issue with flows sending or editing records from the email entity of the Dynamics 365 CDS. The majority of flow runs go through without any issues. While some flows just fail with the following error message:
No object matched the query:
delete from [ActivityPartyBase]
OUTPUT DELETED.[ActivityPartyId], 135, 0
into SubscriptionTrackingDeletedObject (ObjectId, ObjectTypeCode, IsArchivalDelete)
where ([ActivityPartyId] = @ActivityPartyId0)
In most cases this error occurs in two cases: while using IssueSend from "Perform a bound action" or when changing the owning business unit through a simple "Update a row".
Here a screenshot from when this error happens:

Activity parties in this flow are always the same (even when not using the array but the standard way to set activity parties, the error occurs):
[
{
"participationtypemask": 2,
"addressused": "examplemail@company.com"
},
{
"participationtypemask": 1,
"partyid@odata.bind": "systemusers(6ecc3ede-a650-e911-a96c-000d3a44a96b)"
}
]
Any kind of help would be appreciated. I can't find anything about this issue when researching and it's driving me insane, because this flow has to run reliably.