Weird behavior with PPPoE on CRS

Hi all,

Today I was setting up my CRS to have all ports switched (master port ether1), since I also send the LAN back to ether1 (weird setup, I know). The point is that, if I set the PPPoE interface to ether1, PPPoE scan finds nothing. If I create a bridge with just ether1 in it (it of course add dynamically also all the switched ports) and set the bridge to be the PPPoE interface, the connection sets up properly. Any idea why this is happening?

Thanks