fix: Unmount non deferred components immedietly #16638
                
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Note: Alternative to #16633 | Close this, if that PR gets merged
Follows up #16624
failing test case w/ 16638 | The same test case with this PR
In the previous PR, components - even deferred being un-mounted immediately. This PR adds a check so that only non deferred components are unmounted immediately.
Tests and linting
pnpm testand lint the project withpnpm lint