As long as the motion blur is enabled, the alembic hair will be like this both on GPU and CPU
the same project rendered in 3.4 is fine
I think I saw a report with such a bug.
So, it is a bug, not some noob mistake in my setting 
Bugs can be reported on projects.blender.org (or using the help->Report a bug menu item in blender), on general blender use please use one of the community forums as this forum is aimed at blender development only.