Operating system: Windows 10
Graphics card: RTX 2070
Broken: 2.82a, 2.90 Alpha (542ff416e274)
Short description of error
When multires-sculpting an object, then mirroring it on any axis and then applying the scale, the multires displacement inverts - turning inside out. Flipping normals (either before or after applying scale) doesn't help.
In 2.79b, multires data is retained correctly after applying scale, although normals need to be flipped afterwards.
Exact steps for others to reproduce the error
- Pick the default cube, add a multires modifier to it.
- Subdivide a bit for good measure, sculpt something.
- In object mode, mirror the object on any axis.
- Apply scale.
- Observe the sculpt turning inside out.