Syvora boss on Rugosa map bugged

Bug Report ID: #2051417811

Map boss Syvora on Rugosa map just bugged. I was playing with a crossbow and grenades. I stunned the boss with a flash grenade, then threw a couple of explosive grenades. The boss went into the water, and after that nothing else happened. It didn’t attack, move, or trigger the next phase. https://imgur.com/a/nJkCXcc

Same here.
Also playing grenades with Mortar Cannon (Tactician) so probably an issue with pin.