FFAR, Hydra 70,S-8,S-24 (all variants),S-25 (all variants),Nasser 240, Pampero,PRN-122, R4M,Wfr.Gr.21, RZ.65, S-1of, CRV7, Type 3, Type 5, Yasser — with the release of the Sky Odyssey major update, the remote detonation capability has been disabled for unguided aircraft rockets that did not possess this feature in real life.
About the Wfr.Gr.21 (wikipedia) :
Design and capabilities
21 cm Wurfgranate 42.
Modified from the 21 cm Nebelwerfer 42 infantry barrage rocket projectile and reconfigured for air-launch, the spin-stabilised rocket was propelled by 18.4 kilograms (41 lb) diglycol solid fuel, and the warhead weighed 40.8 kilograms (90 lb). The Wfr. Gr. 21’s projectile had a velocity of 320 metres (350 yd) per second (1,150 km/h, 716 mph) and a maximum range of 1,200 metres (1,300 yd). The rocket and tube weighed some 112 kilograms (247 lb) in total. A time fuse detonated the warhead at a pre-set distance of 600 metres (2,000 ft) to 1,200 metres (3,900 ft) from launch point, resulting in a lethal blast area approximately 30 metres (98 ft) wide.
Why now the 21 cm Wurfgranate 42 can be used only with impact fuse?
I doubt the 21 cm Wurfgranate 42 fired from planes were even used to attack ground targets.
Jokes aside, you will need more reliable and acceptable sources to report something like that.
If you find acceptable sources then you can report it here: Gaijin.net // Issues (just search a bit first so that you don’t report something that is already reported and known about)
There are many instances of unguided rockets with only contact fuses being used against bombers since bombers IRL are so slow and big. It doesn’t automatically mean they had a specific type of fuse.
Then double check those sources so that they actually say what the wiki says they do (i’ve had several times where the source doesn’t mention the thing listed on the wiki). If the sources have the information needed then use those sources to create a report.