Hi.
Ok, so your amp is an Emotiova XDA-3, which has an ESS ES9038Q2M SABRE DAC and uses a ComTrue CT7601 chip interface (SXW CTUAD768 PRM-A according to the manual (Xda-3 Rear Panel - Emotiva Differential Reference XDA-3 User Manual [Page 15] | ManualsLib).
From the link you provided (Volumio + Emotiva XDA-3 no native DSD (DSD via DoP only)) , it looks like you’ve already identified where the issue is, which seems to be in the firmware implementation on Emotiva’s side.
It is not a dac chip issue - I’ve run the same chip in native I2S hats and XMOS chips with no issue when playing native DSD or DSD over PCM. And the same with the ESS9039Q2M. Hopefully they get around to fix this soon!