saw that several times, and not just in FP games.

another new bug in FP: conventional howitzer units can shoot down ballistic rockets. not flying bombs, the V-2 rockets.

The initial thing is known and should be fixed.
Can you give more info please? Was the Artillery idling and started shooting automatically at an incoming rocket? Was it ordered to shoot at it while the rocket was still on ground? Or when it was already in air? Did it actually deal damage before the rocket impact happened?

reported it in game, the rocket was launched at a city, the arty in that city was credited with killing the rocket.
this might be just another 'fake news' issue?

I just opened a new thread on this. I launched Level 2 Rockets on a railgun stack. The rockets were shot down. No damage to troops, buildings or morale.

7:32 am Vienna: The 26th Rocket Battery (SOUTH SUDAN) (DX 26) has been destroyed by the 21st Railroad Gun Regiment (POLAND) "".
7:34 am Lwów: The 12th Rocket Battery (SOUTH SUDAN) (DX 12) has been destroyed by the 21st Railroad Gun Regiment (POLAND) "".
7:35 am Prague: The 44th Rocket Battery (SOUTH SUDAN) (DX 44) has been destroyed by the 21st Railroad Gun Regiment (POLAND) "".
7:36 am Białystok: The 27th Rocket Battery (SOUTH SUDAN) (DX 27) has been destroyed by the 21st Railroad Gun Regiment (POLAND) "".
7:42 am Bucharest: The 29th Rocket Battery (SOUTH SUDAN) (DX 29) has been destroyed by the 21st Railroad Gun Regiment (POLAND) "".
7:44 am Sofia: The 9th Rocket Battery (SOUTH SUDAN) (DX 9) has been destroyed by the 21st Railroad Gun Regiment (POLAND) ""

thanks for the reports, It will be investigated

Looks like multiple other people on the discord have noticed similar things. Rockets shouldn't be shot down like this. One noted that the army that destroyed the rocket, wasn't even close to where the rocket destination.