Operating system: - WINDOWS 10.
Graphics card: AMD RADEON RX580 8GB SAPPHIRE NITRO+ EDITION
Broken: BLENDER 2.8 RELEASE CANDIDATE -- blender-2.80rc1-windows64
Short description of error
When using hair particles on a mesh that has modifiers, sometimes the "Use Modifier Stack" option does not function even when checked.
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
1 Opened Blender
2 Modelled a broom from default cube, using subsurf modifier to get rounded feel, but not applying it.
3 Made vertex groups for hair density
4 made 3 hair particle systems, edited settings (Including "Use Modifier Stack" Option.)
5 Combed and cut hair in particle edit mode to satisfaction.
6 Rendered a quick image to find hair behaving sporadic.
7 Tried for a few hours to figure out what went wrong.
8 Applied subsurf modifier and then rendered fine.