How can the ASM instance start when the spfile is located on a diskgroup

SQL> show parameter pfile

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
spfile string +DATA/asm/asmparameterfile/registry.253.729008643

The location of the initialization parameter file specified Grid Plug and Play.
However in the GPnP file, the OLR (Oracle Local Registry) and the OCR (Oracle Cluster Registry) they have the entries to identify the DISCOVERY String and the spfile location.
So ASM can startup but will then access the SPFILE on the ASM diskgroup.

At startup, the Oracle ASM instance attempts to mount the following disk groups:
* Disk groups specified in the ASM_DISKGROUPS initialization parameter
* Disk group used by Cluster Synchronization Services (CSS) for voting files
* Disk groups used by Oracle Clusterware for Oracle Cluster Registry (OCR)
* Disk group used by the Oracle ASM instance to store the ASM server parameter file (SPFILE)