https://www.babylonjs-playground.com/#VXT0UU#1
if you add a sphere immediately, then it is removed through the dispose(), if the box is created by pressing a button, then the dispose() does not work
Hello and welcome!
this is because you are using a var box INSIDE a function so your box variable is not available outside. The fix: create/dispose mesh | Babylon.js Playground (babylonjs-playground.com)
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Thanks a lot! In one case, even with the declaration of a variable in advance, it did not work for me, but now, looking at the full code, I see that I declared the variable “box” before the scene was declared. You helped me a lot, racked my brains for a day 
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My pleasure