FCU Stopped working during descent after clicking LS and VV buttons

[nvmbr]

Descending into KLAX. Got cleared for approach so I switched on LS and VV. Suddenly the speed, heading and altitude were no longer in managed mode. So I pushed each knob in. The PFD and NAV displays flashed for a moment and the dot next to the display came on for just a moment but it disappeared. I tried disengaging and re-engaging autopilot but that did not help. Even in non-managed mode, I could not get the aircraft to obey my selected heading, altitude or vertical speed. Autothrottle still worked and obeyed the speed on the FCU, but the other FCU knobs no longer worked. I was not able to put the aircraft into APPR mode either. AP was turned on, but pushing the APPR button did nothing. The descent rate just stayed with what it was on before the FCU stopped working.

This comes at the tail end of a flight from EGLL. 

I've attached the autosaves, flight plan and screenshot of the console. There were no WASM crashes reported, just the FuelSystem "Could not create pump #n" but those occurred throughout the flight. Link to YouTube video with this bug 

Windows 11

MSFS 2020

7800X3D
7900XTX

1754168924.bin 1754169387.bin 1754169854.bin 1754170338.bin 1754170780.bin EGLLKLAX_PDF_1754171436.pdf