The ACoE are not exactly Oriental Orthodox.
One of their bishops was negotiating with both the Chaldean (Catholic) patriarch and the ACoE Patriarch, in an effort towards reunification. That bishop was Mar Bawai Soros.
He succeeded in attaining a decree of Common Christology through. The ACoE patriarch considered that far enough. Mar Bawai did not.
His views got him censured by the ACoE Synod, then Excommunicated. He and several thousand faithful, plus a couple dozen clerics, went into schism over the issue. They tried to retain their parish buildings. They were sued. I do not recall the outcome.
Mar Bawai and his faithful were received into the Chaldean Catholic Church last year. En masse. (bad pun, I know…)