Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32FG13P/EFR32FG13P231F512GM48/I2C0/SADDRMASK#0x0
Slave Address Mask Register
Slave Address Mask
https://github.com/cmsis-svd/cmsis-svd-data