Unexpected Resampling in ARC

[Jim_F]

Roon ARC: iPhone resampling at 48KHZ

I am trying ARC on the my iPhone XR and noticed that everything is re-sampled to 48khz. This means that lossless is available only for recordings which were originally published at 48khz, while anything else gets a “high quality” tag. Is this normal? I guess it is related to the iPhone DAC but I thought I checked to make sure this is the case

What do you see if you just play to your iPhone speakers? Maybe your car head unit is doing this??