Probuilder meshes prefabs disappear ~ Probuilder hates me

so i actually made these meshes in Blender, but i Probuilderized em just cause the UVEditing was quicker, to make them match up to my materials, with Probuilder

and everything was fine but now they are being finicky and like if i just move one of these meshes, the whole scene full of them disappear
and if i repair them, they disappear,
if i try to export them, they disappear,
if i sneeze they disappear
but if i never ever touch them, they dont disappear lol

… uh i guess they set to “MainCameraCull” layer… in error… but this doesnt matter for this, this is looking at them in the editor…

oh hmm if i strip the probuilder scripts from it its fine though hmm
i guess iam done editing them so yeah

i moved it then pressed Ctrl + Z

WOW nice Repair … >,> “Repair all probuilder objects in scene”

Unity 2019.1.0f2 , Probuilder 4.1.0

It looks like you’ve removed the ProBuilderMesh component, which would explain why the mesh is disappearing. You need that component to stay with your objects as long as they are editable. To remove the ProBuilderMesh component, make sure you first save the MeshFilter asset. This can be done with the “Save to Asset” button in the mesh filter or by Exporting to Asset in the ProBuilder menu.