onDeactivation callback is called on render in StrictMode

[Ke1sy]

I use the React.StrictMode in my application and onDeactivation callback for some logic.
I expect this callback to be called on unmounting or on disabling FocusLock, but in StrictMode it is called on render (it shouldn't happen), also I see that 'onActivation' also is called 2 times:

In comparison to it I am attaching the correct behaviour for not StrictMode:

Sandbox: https://codesandbox.io/p/sandbox/react-focus-lock-demo-forked-nlsfpv
Steps to reproduce this issue:

1. open console
2. click the button
3. review the logs.

To see the expected behaviour, - just remove the <StrictMode> in App.js

It looks like this behaviour is broken when 'react-focus-lock' is used in the application with React v18.

[Ke1sy]

@theKashey Please, review. Thanks!

[theKashey]

👍 that's a valid confusion

• first activation callback is skipped because lock is not yet fully initialized (no ref assigned)
• then deactivation is called via StrictMode rerunning effects
• and then two activation callbacks called because there no prevention for double run