disappearing stalker when converting Ps4

when I convert my world's over to the new edition all my shulkers that were stored in chests/ender chest have gone! I have tried going back to old version to check the shulkers are present and they are there. also checked if it was visual by logging off, restart game and restart console still not there!!! 

i have found a work around!!

1.start up old version of map 

2.place all your shulkers in the world

3.convert to new version

shulkers will be there!!!