Penny Lane being played at the end of Strawberry Fields Forever

I know some of you or even all of you have heard this but at the very end of Strawberry Fields Forever (the 2015 stereo mix) you can hear a part of Penny Lane being played for like 3 seconds very quietly. Nothing crazy I know but something I have just found out myself although I have listened to this song many times. Couldn’t hear it on the Remastered 2009, only on the 2015 mix.