Gap between imported faces that wasn't there in blender

Question

Hi, I have this two objects in blender:

They perfectly line up, the two common vertices have the exact same location.
I exported them using the Better Collada exporter with Triangulate on.
Now my imported object in godot 3 looks like this:

Can you help me figure out where this gap comes from?

Answer 1

export formats are buggy in general.

there is a direct blender exporter and gltf2.0

https://github.com/godotengine/godot-blender-exporter

https://github.com/KhronosGroup/glTF-Blender-Exporter