Connector item/data size limit?

I have a declarative agent with an Azure DevOps 'Get query results' connector as an action. I am having an issue wherein the number of work items that the agent can process and output only seems to be limited to 200+ work items (despite 'Number of Work Items to Return' is set to 2000 and queries have 400+ work items). Is there a data size/number of items limit that the agent can process and output? I can't find any documentation on it.

Test Pane results (Published agent in Teams still not working but that is a separate issue):