Samsung has started seeding an OTA update for the Galaxy A50 which enhances the performance of the touchscreen and improves the moisture detection algorithm.
The latter was introduced by Samsung a long time ago and it monitors the USB port so you won't have any nasty surprises when you attempt to charge your phone. If the sensor detects moisture inside the connector, it would immediately stop charging.
In addition, the stability of the Knox Guard has been improved, August security patch is applied and a few bugs have been squashed.
The new firmware version is A505GNDXU3ASH4 and users in the Philippines are reporting that the update is rolling out in their country. Other markets will presumably be following soon if all goes smoothly.