Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wl3/STM32WL33/DYNAMIC_REG/PCKTLEN_CONFIG#0x0
PCKTLEN_CONFIG register
This bit field has different meanings/usages:
https://github.com/modm-io/cmsis-svd-stm32