HTTP Requests timing out: Ultra task with Salesforce Batch Create

I’m having issues with while testing a pipeline that does a Salesforce Batch Create with nested records. Specifically, HTTP POST requests to the ultra task are timing out…
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Using a record/replay snap, I’ve verified that the pipeline executes successfully and creates Salesforce records:

I created an Ultra task to execute the pipeline. I’m finding that when I execute the task (I’m testing through Postman), the request never returns… and eventually times out:

The dashboard logs indicate that the Salesforce Batch Create snap is receiving multiple input documents but is not outputting anything. My pipeline is configured with an error pipeline

My error pipeline just has a single snap:

I’ve also reviewed the runtime pipeline execution logs and don’t see any indication of what the problem might be. I’ve posted the logs at https://pastebin.com/GVCdTUPg