I just installed OWNR wallet on my mobile phone to see how it works.
I created a new wallet on OWNR and I was able to import both nested segwit and native segwit wallets to Sparrow successfully. You probably did something wrong when importing your segwit wallet into Sparrow.
Thank's for the reply - but there are no "segwit wallets" just segwit transactions - could you make input BTC transaction to this fresh OWNR wallet and then output it ?