When 4 or more TNT entities are in a single block of water, source or flow, it destroys blocks around it anyway. This can be overcome with a couple tricks, but completely changes how cannons, traps and a lot of redstone works
Comments 3
That doesn't solve the problem though, and that prevents me from making cannons that shoot farther than 30 blocks
This only happens if you don't have a block above the explosion, so place a block above where the TNT will explode, and it'll be just fine