Large sequence diagram is omitted from the Navie context

I have this AppMap data file in my project:
org_finos_waltz_integration_test_inmem_service_PhysicalFlowServiceTest_create_PhysicalFlowUsesDefaultExternalIdIfNotSpecified.appmap.json

When I ask Navie a question, it sees the file, but doesn't add it to the context.

Logging in AppMap: Services Output view when DEBUG=true:

56633 [Stdout] Remaining characters before context: 15741
56633 [Stdout] Skipping context item sequence-diagram /Users/ajp/src/finos/waltz/tmp/appmap/junit/org_finos_waltz_integration_test_inmem_service_PhysicalFlowServiceTest_create_PhysicalFlowUsesDefaultExternalIdIfNotSpecified.appmap.json due to size. 7521 > 3148.2
56633 [Stdout] Context item sequence-diagram /Users/ajp/src/finos/waltz/tmp/appmap/junit/org_finos_waltz_integration_test_inmem_service_PhysicalFlowServiceTest_create_PhysicalFlowUsesDefaultExternalIdIfNotSpecified.appmap.json status: item_too_big

• Ensure that at least one sequence diagram is allowed in the context, regardless of the token limit.
• Ensure that at least 5 code snippets are allowed in the context as well.
• Accomplish this behavior by overriding the token limit, rather than trying to predict or recalculate the token limit based on the content size.
• Note that no changes are needed for the frontend / UI to solve this issue.

Start by tracing the context-item size filtering that produces the item_too_big message in the AppMap: Services output. Verify that at least one sequence diagram and five code snippets remain in context despite the token limit, without changing the frontend/UI.