The Wiki states, "A cactus destroys any item that come into contact with it, including other cactus in item form. Falling blocks affected by gravity such as sand and gravel are also destroyed when falling onto cactus,but cactus does not destroy falling cactus blocks; instead, the falling cactus transforms into items upon touching a cactus."
I increased my tick timer to 300 and many of the falling cactus blocks are being randomly destroyed. I have included a screen cap. of the simple test farm.
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creative and used /gamerule randomTickSpeed 300 just for testing leave it alone in survival and build the same thing and you get same results.
Just a lot slower lol
The wiki is referring to the falling block entity and what happens when you use /summon with one for a cactus (e.g. /summon minecraft:falling_block ~ ~40 ~ {BlockState:{Name:"minecraft:cactus"},Time:1}), not a dropped item. That said, the information on the wiki was wrong; sand and gravel convert to items (which are then often destroyed) which is the same as a summoned falling cactus. I've edited it to make it clearer.
The behavior with items (which is what you'd get with the setup in the screenshot) being destroyed by cactus is different, and is covered by MC-3532.
This is not a vanilla feature; bugs are only accepted with unmodified games.