Opensuse Leap 42.1 Linux, ATI graphics card
Short description of error
If i add an custom properties, manually or by python api. Alembic export doesn't take care of them (custom properties).
If the alembic file is reloading in blender the custom properties are disappeared. Same for an extra 3d software (maya , guerilla...)
By exemple all 'extra attr' in maya are exported in native alembic export.
In a robust pipeline the absence of this 'custom properties' is a really problems.
Exact steps for others to reproduce the error
-type : pby.context.object["MyCustomProps"] = "foo"
or add it manually in properties panel.
-file > export alembic
-file > import alembic