themed useCreateStyles creates className mismatch when hydrating in StrictMode

__Expected behavior:__
`className` matches during hydration

__Describe the bug:__
The counter in the className is off by one

__Codesandbox link:__
https://codesandbox.io/s/createusestyles-classname-mismatch-zdojq?file=/src/App.js

The useLayoutEffect warnings are false positives since we SSR in the browser to showcase the issue better.
__Versions (please complete the following information):__
- jss: 10.1.1
- Browser [e.g. chrome, safari]: Chrome 81
- OS [e.g. Windows, macOS]: ubuntu 18.04
- react: 16.13.1

Open the linked CodeSandbox and inspect /src/App.js, starting with the themed useCreateStyles usage and the hydration path in StrictMode. Reproduce the mismatch in Chrome with the reported versions, then verify that the className counter matches between server rendering and hydration.

Written by the indexing model from the issue text.