[Tee tiong huat]

The TOS-1A’s issue is its range. It is stated that the effective range of the TOS-1A with target destruction is approximately 6000 meters. In order to launch, the system must enter the area affected by enemy artillery, some anti-tank weapons, and drones, which increases the chance of destroying the vehicle during its operation.

TOS-1A tried to open fire near Novoselivka Druha in the Avdiivka sector. The village is located near Avdiivka. This means that the Russian system had to come quite close to launch the shots. Similar cases were recorded by Russian operators who were filming the work of TOS-1А Solntsepyok and immediately came under artillery fire from Ukrainian forces. 

The heavy flamethrower system was presumably hit by a conventional drone with explosives. The Ukrainian military observed destruction of heavy flamethrower system from a surveillance system.
https://mil.in.ua/en/news/the-armed-forc...defenders/