Hi @gkaralov,
Reviewing our changelogs, I can see that this was changed back in version 8.3.0, released on 2023-11-16. This was meant to avoid users previewing outdated information if someone else is actively working on that order and possibly making edits.
You can learn more about this change here: https://github.com/woocommerce/woocommerce/pull/40730.
I understand you’d like this change revoked, but that isn’t an option at this time. I think you could submit a feature request to make it optional and have a toggle to switch it on or off, though. We have a website where you can submit feature requests and upvote the ones other people submitted and you like. You can check that out?here.
For more inmediate action, a custom code solution would help you bring back this feature. I can recommend the Woo Developer Resources Portal for resources on developing for WooCommerce. You can also visit the WooCommerce Facebook group or the #developers
channel of the Woo Community Slack. We’re lucky to have a great community of open-source developers for Woo, and many of our developers hang out there, as well.
Please let us know if there’s anything else we can do to help at this time or if you have further questions.
Have a wonderful day!
-OP