themed useCreateStyles creates className mismatch when hydrating in StrictMode

[eps1lon]

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