Using Bedrock Dedicated Server and playing on Xbox.
Have tested on Xbox in creative mode. Edit Also tested on Windows UWP version to get the video and world save.

On our survival server my wife and I have built a frog light farm which has frogs sat on a later of honey blocks to stop them and magma cubes jumping and have found that we are barley getting any froglights.

When I went into a creative world I built two 4x4 chambers, one with grass on the floor, the other with honey blocks. When I put magma cubes in (and made sure they were all the small ones) the frogs in the grass floor side chased the cubes down and devoured them, the frogs on the honey side occasionally ate a cube, usually within the first 5sec of spawning the frog in, after sitting around they did nothing.