NvAPI_DISP_TryCustomDisplay and logical refresh rate

When using NvAPI_DISP_TryCustomDisplay the logical refresh rate in NV_TIMINGEXT seems to be ignored. I put 59 in rr and 59940 in rrx1k. The physical refresh rate my monitor receives is 59.94 Hz. This is correct. But NVIDIA control panel shows 60 Hz. It should be 59 Hz.

Is this a bug?

Dear @FoLLgoTT

Thank you for contacting NVIDIA developer forum.
We have sent your query to the respective team for details and we will get back to you on same.

Thanks,
NVAPI Forum Moderator

Dear @FoLLgoTT

Just to update you that I am waiting to hear back from the concerned development team. I appreciate your patience.

Thank you.
NVAPI Forum Moderator