**System Information**
Operating system: Windows-10-10.0.19042-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2060 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 496.76
**Blender Version**
Broken: version: 3.1.0 Alpha, branch: master, commit date: 2021-12-29 23:51, hash: `rB9d3264b4fd04`
Worked: Probably never
**Short description of error**
When the GPU option is enabled for the subdivision surface modifier, the subdivision doesn't appear on free edges of meshes affected by the modifier
**Exact steps for others to reproduce the error**
# On default cube or any other mesh, switch to edit mode
# Select a single vertex and extrude it several times to create multiple poly lines
# Switch back to object mode
# Add a subdivision modifier to the object ( press ctrl+2)
# Open the preferences / viewport / Subdivision tab
# Check and uncheck the gpu subdivision option and observe the differences on the subdivided mesh