nvidia-settings only allows setting GPUMemoryTransferOffset and GPUGraphicsClockOffset for [gpu:0]

nvidia-settings: version 470.57.01
with Option "Coolbits" "28" and Option "AllowEmptyInitialConfiguration" "True" on both X screens.

Even the GUI shows the "Editable Performance Levels" section for GPU 0 only as shown in this stackexchange question:
https://unix.stackexchange.com/questions/354958/how-to-overclock-multiple-nvidia-gpus-in-ubuntu?newreg=f0cf58cf990d4c16beed86feaed3340d

From the CLI:

# nvidia-settings -v -q [gpu:0]/GPUMemoryTransferRateOffset

ERROR: An internal driver error occurred


ERROR: An internal driver error occurred


ERROR: An internal driver error occurred


ERROR: An internal driver error occurred


ERROR: An internal driver error occurred


ERROR: An internal driver error occurred


ERROR: An internal driver error occurred


  Attribute 'GPUMemoryTransferRateOffset' (mpc:0[gpu:0]): 2000.
    The valid values for 'GPUMemoryTransferRateOffset' are in the range -2000 - 6000
    (inclusive).
    'GPUMemoryTransferRateOffset' can use the following target types: X Screen, GPU.

Using -a isntead of -q works and does set a value.

However, for GPU 1:

# nvidia-settings -v -q [gpu:1]/GPUMemoryTransferRateOffset

ERROR: An internal driver error occurred


ERROR: An internal driver error occurred


ERROR: An internal driver error occurred


ERROR: An internal driver error occurred


ERROR: An internal driver error occurred


ERROR: An internal driver error occurred


ERROR: An internal driver error occurred


WARNING: Attribute 'GPUMemoryTransferRateOffset' specified in query '[gpu:1]/GPUMemoryTransferRateOffset' is not available on mpc:0[gpu:1].

It fails to show the current value when querying, and using -a instead of -q does not work and does not set a value.

Here, assignment yields:

# nvidia-settings -V -a [gpu:1]/GPUMemoryTransferRateOffset=2000

...

WARNING: Attribute 'GPUMemoryTransferRateOffset' specified in assignment '[gpu:1]/GPUMemoryTransferRateOffset=2000' is not available on mpc:0[gpu:1].

Querying perfmodes works on both GPUs, for GPU 1 it yields:

# nvidia-settings -q [gpu:1]/GPUPerfModes

ERROR: An internal driver error occurred


ERROR: An internal driver error occurred


ERROR: An internal driver error occurred


ERROR: An internal driver error occurred


ERROR: An internal driver error occurred


ERROR: An internal driver error occurred


ERROR: An internal driver error occurred


  Attribute 'GPUPerfModes' (mpc:0[gpu:1]): perf=0, nvclock=300, nvclockmin=300,
  nvclockmax=645, nvclockeditable=1, memclock=405, memclockmin=405, memclockmax=405,
  memclockeditable=1, memTransferRate=810, memTransferRatemin=810, memTransferRatemax=810,
  memTransferRateeditable=1 ; perf=1, nvclock=300, nvclockmin=300, nvclockmax=2100,
  nvclockeditable=1, memclock=810, memclockmin=810, memclockmax=810, memclockeditable=1,
  memTransferRate=1620, memTransferRatemin=1620, memTransferRatemax=1620,
  memTransferRateeditable=1 ; perf=2, nvclock=300, nvclockmin=300, nvclockmax=2130,
  nvclockeditable=1, memclock=5001, memclockmin=5001, memclockmax=5001,
  memclockeditable=1, memTransferRate=10002, memTransferRatemin=10002,
  memTransferRatemax=10002, memTransferRateeditable=1 ; perf=3, nvclock=300,
  nvclockmin=300, nvclockmax=2130, nvclockeditable=1, memclock=7501, memclockmin=7501,
  memclockmax=7501, memclockeditable=1, memTransferRate=15002, memTransferRatemin=15002,
  memTransferRatemax=15002, memTransferRateeditable=1 ; perf=4, nvclock=300,
  nvclockmin=300, nvclockmax=2130, nvclockeditable=1, memclock=7751, memclockmin=7751,
  memclockmax=7751, memclockeditable=1, memTransferRate=15502, memTransferRatemin=15502,
  memTransferRatemax=15502, memTransferRateeditable=1

Start by reproducing the nvidia-settings query and assignment commands on GPU 0 and GPU 1, using the reported Coolbits and X-screen configuration. Trace the CLI handling for GPUMemoryTransferRateOffset and related attributes; done means querying and assigning the offset works consistently for GPU 1 as it does for GPU 0.