System Information
Operating system: Darwin-19.6.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 575X OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.10.18

Blender Version
Broken: version: 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: rB3e85bb34d0d7
Worked: 2.83.6

Short description of error
Sliding vertex along an edge using double tap G causes the UVs to distort and they remain messed up.

Exact steps for others to reproduce the error
Using a mesh that has been unwrapped double tap G to slide the vertex along an edge. Intermittently the UV will get stretched (it looks like to infinity) and be messed up. It isn't an issue with every vertex and seems to vary depending whether there are pinned UVs or not. To get the screenshots provided I had to try several vertices before I could replicate the issue.

This happens on factory settings with no addons enabled.