Fixes #22466. Regression from #22377.
@ -152,6 +152,7 @@ extends = stm32_variant
board = marlin_STM32F407VGT6_CCM
board_build.variant = MARLIN_BIGTREE_E3_RRF
board_build.offset = 0x8000
extra_scripts = ${common.extra_scripts}
build_flags = ${stm32_variant.build_flags}
-DSTM32F407_5VX
-DMF_RX_BUFFER_SIZE=255