Steps to recreate:
1. New Vector layer
2. Create Grid Shape (i.e. 5x5 or 6x6)

3. Triangulate 2D Mesh & Witness a broken mesh with gaps

(recolored fills to highlight)
This was picked up from a discussion on Moho Creators Discus (@Ozzy and @Gizmo)
Moderators: Víctor Paredes, Belgarath, slowtiger