Also, around 15:19:50, according to the data shown in the webcast, all thrusters on the SLIM lander were firing at abnormally high rates and the spacecraft was rotating along all 3 axes.
The clock on the display was frozen at 15:18:50 and then jumped to 15:19:03, indicating perhaps a loss of telemetry during that interval.
Things certainly did not look healthy around touchdown time. Although, this could be a telemetry glitch.