Error messages are not landing in the DLQ

**Describe the bug**
I expect that the error that this flow produces will land in the DLQ, like it happens on 4.17.10.

**To Reproduce**
`curl --location 'https://next.dovetail.world/test/inbound_http/regressiontests/DeadLetter' \
--header 'Content-Type: application/xml' \
--data '<root>DLQ</root>'`

**Flow**
Instance: next
Tenant: Regression Tests
Flow: DeadLetter

**Screenshots**
Not applicable.
