Integrated GWC does not kick in when making request not qualified by workspace

Integrated GWC is unable to find a layer belonging to default workspace, when the OWS request has no mention of workspace as part of layer name or inside the request URL.

Steps to reproduce:

• Enable GWC WMS Integration in Geoserver

• Enable Tile Caching on a random layer

• Make a WMS request with Tiled=true param set and BBOX matching GWC gridset. (Can be obtained by previewing the GWC layer)

The HTTP response headers will show
geowebcache-cache-result: MISS
geowebcache-miss-reason:* not a tile layer*