Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32TG11B/EFM32TG11B520F128IM80/I2C1/RXDOUBLE#0x0
Receive Buffer Double Data Register
RX Data 0
RX Data 1
https://github.com/cmsis-svd/cmsis-svd-data