**System Information**
Operating system: macOS-10.15.7-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro Vega 64 OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.10.18
**Blender Version**
Broken: version: 2.93.2, branch: master, commit date: 2021-08-03 05:58, hash: `rB1eb06de2607a`
Worked: Probably never
**Short description of error**
Motion blur drops on random frames in Eevee when using alembic file
**Exact steps for others to reproduce the error**
Please try to render the file in the link with motion blur
https://www.dropbox.com/s/2usvjyis2yl9a0d/bmx-2020_60_00fps_FILTERED_2880.abc.zip?dl=0