1.16.220, 126.96.36.199 RTX Beta, 188.8.131.52 Beta, 1.9.0, 184.108.40.206 Beta, 1.14.60 Hotfix, 1.16.0, 1.16.1, 1.16.40 Hotfix, 1.16.100, 1.16.200, 1.16.201 Hotfix, 1.16.210, 1.18.12 Hotfix
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
Stand by a spawner in survival mode(any mob)
Look at your Y Level
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