fix

src/api/printables.ts

@@ -53,7 +53,8 @@ export async function postStickerGenerate(formData: FormData): Promise<Blob> {
         : ''
     throw new ApiHttpError(msg || `HTTP ${res.status}`, res.status, errBody)
   }
-  return res.blob()
+  const raw = await res.blob()
+  return new Blob([await raw.arrayBuffer()], { type: 'application/pdf' })
 }
 
 export async function postBadgeGenerate(formData: FormData): Promise<Blob> {
@@ -73,7 +74,8 @@ export async function postBadgeGenerate(formData: FormData): Promise<Blob> {
         : ''
     throw new ApiHttpError(msg || `HTTP ${res.status}`, res.status, errBody)
   }
-  return res.blob()
+  const raw = await res.blob()
+  return new Blob([await raw.arrayBuffer()], { type: 'application/pdf' })
 }
 
 export type StickerPreviewCounts = {
@@ -271,7 +273,7 @@ export async function openReportCardDownload(url: string): Promise<void> {
   if (token) headers.set('Authorization', `Bearer ${token}`)
   const res = await fetch(url, { headers })
   if (!res.ok) throw new ApiHttpError(`HTTP ${res.status}`, res.status, null)
-  const blob = await res.blob()
-  const r = URL.createObjectURL(blob)
-  window.open(r, '_blank', 'noopener')
+  const raw = await res.blob()
+  const blob = new Blob([await raw.arrayBuffer()], { type: 'application/pdf' })
+  window.open(URL.createObjectURL(blob), '_blank', 'noopener')
 }