diff --git a/src/main/jira/favourite-filters-transport.test.ts b/src/main/jira/favourite-filters-transport.test.ts
new file mode 100644
index 00000000000..a25881a3ae2
--- /dev/null
+++ b/src/main/jira/favourite-filters-transport.test.ts
@@ -0,0 +1,179 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { FetchResponseBodyTooLargeError } from '../../shared/fetch-response-body'
+import { setMainHttpClient } from '../network/http-client'
+import type { JiraClientForSite } from './authenticated-request'
+import { listFavouriteFilters } from './favourite-filters'
+import { JiraApiError } from './jira-api-error'
+
+const { getClients } = vi.hoisted(() => ({ getClients: vi.fn() }))
+vi.mock('./client', () => ({ getClients }))
+vi.mock('../network/proxy-settings', () => ({
+  ensureElectronProxyFromEnvironment: vi.fn().mockResolvedValue(undefined)
+}))
+vi.mock('../observability/tracer', () => ({
+  withSpan: (
+    _name: string,
+    run: (span: { setAttribute: () => void; addEvent: () => void }) => Promise<unknown>
+  ) => run({ setAttribute: () => {}, addEvent: () => {} })
+}))
+
+const client: JiraClientForSite = {
+  site: {
+    id: 'site-1',
+    siteUrl: 'https://jira.test',
+    email: '',
+    displayName: 'Jira',
+    accountId: 'me'
+  },
+  authorization: 'Bearer fixture-token'
+}
+const maxBytes = 2 * 1024 * 1024
+const filter = { id: '1', name: 'Mine', jql: 'assignee = currentUser()' }
+const encoder = new TextEncoder()
+
+function installTransport(read: (signal: AbortSignal) => Promise<Response>) {
+  const started = Promise.withResolvers<AbortSignal>()
+  const aborted = vi.fn()
+  const fetch = vi.fn(async (_url: string, init?: RequestInit) => {
+    const signal = init?.signal
+    if (!signal) {
+      throw new Error('Expected an operation signal')
+    }
+    signal.addEventListener('abort', aborted, { once: true })
+    started.resolve(signal)
+    return read(signal)
+  })
+  setMainHttpClient({ fetch, proxySession: () => null })
+  return { started: started.promise, aborted, fetch }
+}
+
+beforeEach(() => {
+  vi.clearAllMocks()
+  vi.useFakeTimers()
+  getClients.mockReturnValue([client])
+})
+
+afterEach(() => {
+  setMainHttpClient(null)
+  vi.useRealTimers()
+})
+
+describe('favourite filter transport ownership', () => {
+  it.each(['declared', 'streamed'] as const)(
+    'aborts a rejected %s oversized response without aborting the caller',
+    async (kind) => {
+      const cancel = vi.fn()
+      const body = new ReadableStream<Uint8Array>({
+        start(controller) {
+          if (kind === 'streamed') {
+            controller.enqueue(new Uint8Array(maxBytes + 1))
+          }
+        },
+        cancel
+      })
+      const response = new Response(body, {
+        headers: kind === 'declared' ? { 'content-length': String(maxBytes + 1) } : {}
+      })
+      const transport = installTransport(async () => response)
+      const parent = new AbortController()
+
+      await expect(listFavouriteFilters('site-1', parent.signal)).rejects.toEqual(
+        new FetchResponseBodyTooLargeError(maxBytes + 1, maxBytes)
+      )
+
+      expect(cancel).toHaveBeenCalledOnce()
+      expect(transport.aborted).toHaveBeenCalledOnce()
+      expect(parent.signal.aborted).toBe(false)
+      expect(vi.getTimerCount()).toBe(0)
+    }
+  )
+
+  it('consumes the complete JSON body before retiring a successful transport', async () => {
+    const body = new TransformStream<Uint8Array, Uint8Array>()
+    const writer = body.writable.getWriter()
+    const transport = installTransport(async () => new Response(body.readable))
+    const parent = new AbortController()
+    const finished = vi.fn()
+    const read = listFavouriteFilters('site-1', parent.signal).finally(finished)
+    const signal = await transport.started
+
+    await writer.write(encoder.encode('['))
+    expect(signal.aborted).toBe(false)
+    expect(finished).not.toHaveBeenCalled()
+    await writer.write(encoder.encode(`${JSON.stringify(filter)}]`))
+    expect(signal.aborted).toBe(false)
+    await writer.close()
+
+    await expect(read).resolves.toEqual({
+      filters: [{ ...filter, siteId: 'site-1' }],
+      truncated: false
+    })
+    expect(transport.aborted).toHaveBeenCalledOnce()
+    expect(parent.signal.aborted).toBe(false)
+    expect(vi.getTimerCount()).toBe(0)
+  })
+
+  it.each(['transport', 'body'] as const)('preserves the original %s error', async (kind) => {
+    const error = new Error(`${kind} failed`)
+    const transport = installTransport(async () => {
+      if (kind === 'transport') {
+        throw error
+      }
+      return new Response(
+        new ReadableStream({
+          start(controller) {
+            controller.error(error)
+          }
+        })
+      )
+    })
+    const parent = new AbortController()
+
+    await expect(listFavouriteFilters('site-1', parent.signal)).rejects.toBe(error)
+
+    expect(transport.aborted).toHaveBeenCalledOnce()
+    expect(parent.signal.aborted).toBe(false)
+    expect(vi.getTimerCount()).toBe(0)
+  })
+
+  it('preserves HTTP status when an oversized error body is cancelled', async () => {
+    const cancel = vi.fn()
+    const transport = installTransport(
+      async () =>
+        new Response(new ReadableStream({ cancel }), {
+          status: 403,
+          statusText: 'Forbidden',
+          headers: { 'content-length': String(maxBytes + 1) }
+        })
+    )
+
+    await expect(listFavouriteFilters('site-1')).rejects.toEqual(new JiraApiError('Forbidden', 403))
+
+    expect(cancel).toHaveBeenCalledOnce()
+    expect(transport.aborted).toHaveBeenCalledOnce()
+    expect(vi.getTimerCount()).toBe(0)
+  })
+
+  it('cancels an active request at the deadline without aborting the caller', async () => {
+    const error = new DOMException('fixture request aborted', 'AbortError')
+    const transport = installTransport(
+      (signal) =>
+        new Promise((_resolve, reject) => {
+          signal.addEventListener('abort', () => reject(error), { once: true })
+        })
+    )
+    const parent = new AbortController()
+    const read = listFavouriteFilters('site-1', parent.signal)
+    const rejected = expect(read).rejects.toBe(error)
+    await transport.started
+
+    await vi.advanceTimersByTimeAsync(24_999)
+    expect(transport.aborted).not.toHaveBeenCalled()
+    await vi.advanceTimersByTimeAsync(1)
+
+    await rejected
+    expect(transport.aborted).toHaveBeenCalledOnce()
+    expect(parent.signal.aborted).toBe(false)
+    expect(vi.getTimerCount()).toBe(0)
+  })
+})
diff --git a/src/main/jira/jira-read-failure.ts b/src/main/jira/jira-read-failure.ts
index e2bee2285a7..37c9ea4e04a 100644
--- a/src/main/jira/jira-read-failure.ts
+++ b/src/main/jira/jira-read-failure.ts
@@ -6,7 +6,7 @@ export type JiraIssueSearchFailure = {
   auth: boolean
 }
 
-/** Run against one signal that trips on the caller's abort or the request deadline. */
+/** Bound a fully consumed read by caller cancellation and a deadline, then retire its signal. */
 export async function withJiraDeadline<T>(
   signal: AbortSignal | undefined,
   timeoutMs: number,
@@ -24,6 +24,7 @@ export async function withJiraDeadline<T>(
   } finally {
     clearTimeout(timer)
     signal?.removeEventListener('abort', abort)
+    controller.abort()
   }
 }