Graphcache 6 executes offline mutations twice

[Psvensso]

Describe the bug

When switching over to graphcache 6.0.0 we see that our mutations are fired twice after being offline.
Works fine with graphcache 5.2.0

Browser: Chrome

Repro steps:

1. Open sandbox https://codesandbox.io/s/hungry-franklin-fw5w0s
2. F12 > Network > Offline
3. Click a todo item to issue a toggle mutation
4. F12 > Network > No throttle

Expected:
toggle mutation to be sent once

Actual:
the toggle mutation is sendt twice to the server

Reproduction

https://codesandbox.io/s/hungry-franklin-fw5w0s

Urql version

"@urql/core": "4.0.4",
"@urql/exchange-graphcache": "6.0.0"

Validations

• I can confirm that this is a bug report, and not a feature request, RFC, question, or discussion, for which GitHub Discussions should be used
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