Order switches back to "Pending payment" after being paid & invoiced

Describe the bug Figured it might have been the same bug as https://github.com/mollie/magento2/issues/791 but it does seem to be different as we don't actually see the status update.

As described in the title: We very occasionally have orders that revert back to the pending payment state after hitting the processing state. They also have a paid invoice. The weird part is that there doesn't seem to be an update of the state/status through the Order model, it looks like it's circumventing the Order model completely. I'm also not sure it's Mollie that's causing this but I'm kinda out of ideas, so any input is welcome.

We've got an order that's progressed to processing:

Yet it's state is still pending payment:

So I've added a plugin around setData for the Order to maybe find the culprit:

Yet, it isn't called:

system.log:[2024-07-24T09:14:34.858357+00:00] main.INFO: [ECS] Changing state/status of order {"order":null,"increment":"2000066665","before":"payment_review : ","after":"payment_review : payment_review"} []
system.log:[2024-07-24T09:14:34.859281+00:00] main.INFO: [ECS] Changing state/status of order {"order":null,"increment":"2000066665","before":"payment_review : payment_review","after":"pending_payment : payment_review"} []
system.log:[2024-07-24T09:14:34.860500+00:00] main.INFO: [ECS] Changing state/status of order {"order":null,"increment":"2000066665","before":"pending_payment : payment_review","after":"pending_payment : pending_payment"} []
system.log:[2024-07-24T09:15:04.286459+00:00] main.INFO: [ECS] Changing state/status of order {"order":"114627","increment":"2000066665","before":"pending_payment : pending_payment","after":"processing : pending_payment"} []
system.log:[2024-07-24T09:15:04.287438+00:00] main.INFO: [ECS] Changing state/status of order {"order":"114627","increment":"2000066665","before":"processing : pending_payment","after":"processing : processing"} []

The state of the order corrects itself if we re-fetch the status using the "Update Payment Status" button in Mollie (which leads me to believe it has to be something in the plugin, but again: just guessing at this point).

Any idea where I might look and/or what I can log/track/wrap to maybe find the culprit? Or at least: exclude Mollie from being a suspect.

Used versions

Magento Version number(eg 2.3.5): 2.4.6-p6
Open source/Enterprise/B2b: Open Source
Mollie version number (Check configuration): 2.40.0

mollie / magento2

Order switches back to "Pending payment" after being paid & invoiced #802