I placed down a shulker box, any color (doesn't matter which color) then I place a torch on top of it... When I open the shulker the torch appear to be inside the shulker and does not break... Sometimes it causes players to lagg, as my friends seem to experience lagg when I ask them to try it for themselves.

This issue most likely does not occur with just 1.14.4, but rather with all minecraft versions that have shulker boxes.