System Information
Operating system: Linux-5.4.0-39-generic-x86_64-with-debian-bullseye-sid 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.100
Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-20 04:49, hash: rBd994391e0c6e
Worked: 4d790516fbf8
Short description of error
In the lastest 2.9 builds offset for uvs its only for mirrored uvs and those should be two different options as in 2.8.
Offset its mainly used to avoid baking errors with overlap uvs by moving the uv's outside off the 0 to 1 uv space but not mirrored only offset.
in 2.8 an early 2.9, before the drag-able modifiers where added, offset where different for mirrored and for just plain offset
Exact steps for others to reproduce the error


