NSH: ps command broken between release 12.0 and 12.1

I noticed, that the ps command of the NSH library broke between release 12.0 and 12.1.

Specifically, I am testing the nucleo-h743zi2:nsh config, where I enabled CONFIG_FS_PROCFS and CONFIG_NSH_ARCHINIT to get the ps command in NSH. When executing the command (sometimes only on the second try) I get a hardfault. This starts happening with release 12.1 (still apparent with 12.3) and works as expected on 12.0.

Before debugging this in more detail. maybe somebody can help pointing in the right direction? I see that the LR points to tls_get_info and the PC to getumask during the hardfault.

Thanks!