Only share incremental cache for edge in next start

Author: ijjk

packages/next/src/server/base-server.ts

@@ -2455,15 +2455,13 @@ export default abstract class Server<
       protocol = parsedFullUrl.protocol as 'https:' | 'http:'
     } catch {}
 
-    // use existing incrementalCache instance if available
     const incrementalCache: import('./lib/incremental-cache').IncrementalCache =
-      (globalThis as any).__incrementalCache ||
-      (await this.getIncrementalCache({
+      await this.getIncrementalCache({
         requestHeaders: Object.assign({}, req.headers),
         requestProtocol: protocol.substring(0, protocol.length - 1) as
           | 'http'
           | 'https',
-      }))
+      })
 
     // TODO: investigate, this is not safe across multiple concurrent requests
     incrementalCache.resetRequestCache()

packages/next/src/server/web/adapter.ts

@@ -185,10 +185,7 @@ export async function adapter(
     })
   }
 
-  if (
-    !(globalThis as any).__incrementalCache &&
-    (params as any).IncrementalCache
-  ) {
+  if ((params as any).IncrementalCache) {
     ;(globalThis as any).__incrementalCache = new (
       params as any
     ).IncrementalCache({