Can not find the ecc_errors-volatile-single_bit in the nvidia-smi -q -x.

My application needs to read this xml element in nvidia -q -x :

<ecc_errors>

<single_bit>
<device_memory>N/A</device_memory>
<register_file>N/A</register_file>
<l1_cache>N/A</l1_cache>
<l2_cache>N/A</l2_cache>
<texture_memory>N/A</texture_memory>
<texture_shm>N/A</texture_shm>
N/A
N/A

But I can’t find this element in the output of the RTX 2080ti. The counterpart of the RTX 2080ti is:

<ecc_errors>

<sram_correctable>N/A</sram_correctable>
<sram_uncorrectable>N/A</sram_uncorrectable>
<dram_correctable>N/A</dram_correctable>
<dram_uncorrectable>N/A</dram_uncorrectable>

Where is the single_bit element ? Thanks!