Relative accelerated values not sent via USB

Howdy! So in the relative control, while the E1 correctly shows accelerated values when turning the knob quickly, those values aren’t exported via USB - no matter the speed, the export is just the -1 and +1 equivalents for the selected relative mode.
This is with the most recent mk1 firmware.
(Acceleration with absolute faders is output correctly for 14-bit midi, FWIW).
Am I missing a setting, or is this a bug?