Joining objects in Blender 2.8 causes the objects to disapear I created multiple objects in Blender 2.8 using the Bezier curves and converted them to Mesh using the Object->Convert To->Mesh from Curve. 



Now for whatever reason when I select all of the objects in object mode and do "Ctrl+J" to join them, 5 of the objects disappear and I'm left with only one.



I tried to replicate this again, but it's working fine for all of the other objects I try to join, it only acts like this for these 6 specific objects. I tried to select them and export them and then re-import, but for some reason blender is exporting only 80bytes for the STL, not sure if it's related or not.

When I go into the edit mode, I can see that they're all "Mesh" instead of "Curve" why is it acting like this? I never have faced this issue before, maybe I enabled some kind of 'property' for the object that causes this? Thanks!

Here is the Blend file:
This looks like a bug. But you can use a helper object, to merge these objects.


Add a Curve Object. &#8679; ShiftA > Curve > Bezier
Go into edit mode &#8633; Tab and delete X the selected control points leaving you with an empty bezier. Exit edit mode &#8633; Tab.
Select all other objects with the border selection B. [Make sure, that the newly created (empty) bezier object stays the active object.]
Merge them with &#9096; CtrlJ.