Two by two achievement bug

Hello Mojang

I found a bug in the 1.16 Pre-release 2 and I want to show this to fix it.

 

If you feed the turtles the two by two achiement completed automatically.

 

And I want to complete this achiement in creative mod and I watched how many animals are there in minecraft. The achiement said 19 but I just found 16 animals what can I feed.

 

Please fix this bug/bugs

 

Thanks : Márk