That's the problem with simply losing communication. It's not positive evidence of a crash, it's just a lack of information. Possibly the landing jostled antennas or power relays causing a communications glitch... but you can't rule out that it just crashed :(
It happened before landing, so while the probe may have crashed, a crash did not cause the communications loss. Here are the most similar conditions I could find that recovered: Beresheet regained communications before landing but not in time to save the mission. Rosetta's Philae lander ended up in a bad spot and couldn't communicate much because of low solar power. Hayabusa had comms trouble when it was supposed to launch from its asteroid, but recovered.
