Unable to update after timeout log out 3.6.2

[alanef]

Describe the bug
If you have a security plugin that times out in a relatively short period of inactivity, whilst you are editing, when you log straight back back - updates will always fail. Gutenberg 3.6.2

To Reproduce
Steps to reproduce the behavior:

1. set up a short time out by changing filter auth_cookie_expiration
2. start editing
3. wait til you get logged out
4. log back in
5. try and save - update fails ( complete guess but perhaps the cookies are not re checked to see if they are now valid )

Expected behavior
Saving should work after logging back in.
Classic editor works fine.

Screenshots
If applicable, add screenshots to help explain your problem.

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[designsimply]

Welcome and thanks for testing! I'm closing this as a duplicate of #8892. Please follow along at that issue.