In F-15E training mission Radio Use, I followed the instruction to jump back to previous frequency with decimal by pressing UFC 6, however, the pervious frequency flickered in the scratchpad. In Baltic Dragon's demostration video posted in April 4th, 2023, the frequency also had decimal and could jump back to previous one by following the instruction.
BD's demonstration video:
https://www.youtube.com/watch?v=OAsLsvfLF6U
My operation video:
Radio Use .mp4
In Radio 2, with frequency 127MHz, the UFC shows wrong legend which should "V" not "U".