One thing is happening to the default page of the root site of the tenancy. Minor-Major Versioning is applied with only editors able to see drafts. Check in and out is applied. No approval.
When you are done editing version 3.1, in a normal situation with the same settings all users (with reading permissions) should be able to see version 3.0 (the immediately previous major version). However our readers get access denied. The access denied like this image
Any other page in the same page library instead behaves as it should, showing users the previous major version.
Is there something not set up right or the default page of the root site collection behaves differently by design?