Mob spawner collision box is smaller than a full block on all sides.

I was playing on a survival world with no cheats on but coordinates were on. Also no resource packs or behavior packs were enabled. 

 

I was standing on cobblestone next to a spawner I found at Y level 37 and then I jumped on top of the spawner and I was still at level 37 even though i was a block higher than that. I tried this with both a skeleton and a zombie spawner and both did the same thing. 

 

How to recreate this bug
Step 1:
Stand by a spawner in survival mode(any mob)
Step 2:
Look at your Y Level
Step 3
Jump on top of the spawner
Step 4 look at your Y level again.

To put this short the Y level didnt change when I jumped on or off the spawner and this only worked with a spawner no other block I tried did this.

I was playing on my Galaxy S7