Ok this is a bit awkward as it involves a series of steps, but I’m posting this hoping any of the beta-testers on iPadOS can try this an tell me if this iOS 12 bug is still there on iPadOS on a 11” iPad (This doesn’t happen on 10,5” iPads, just in the 11” and only in landscape)
It involves the small bubble that appears on top when you’re recording or have a dongle connected, or you’re in the middle of a phone call (red bubble, blue bubble, and green bubble respectively). Also it involves the control centre and having the split view activated with 75% of space at the right, and 25% on the left, with the 75% screen being a PDF reader like Books or Documents by Readdle with an actual PDF on it. The app on the 25% at the left doesn’t matter.
Steps to trigger the bug successfully, I repeat, on an iPad Pro 11”, on landscape:
1- Start a recording to get that red bubble at the top right of the screen. The dongle thing doesn’t work because it just last few seconds after plugged, then disappears. And the phone call works as well to trigger the bug but I’m not asking you to make a phone call on the iPad Pro just because of me.
2- Open a PDF on Documents by Readdle or in Apple Books. If it’s just a Book from the Apple Books Store it may work as well, but just to be sure, use a PDF, and when split viewing, use the 75% of the right space for the PDF.
3- Open another app, Pages or another text editor for instance, to split view it along with the PDF, taking the 25% of the screen at the left.
4- Make sure you’re still recording, and just invoque the Control Centre, whie still in landscape, swiping down from the top right corner.
If done correctly, all the apps will restart and the springboard will reload completely.
If you’re followed all the steps and this doesn’t happen, please let me know, because that means Apple finally fixed it.
If it still breaks the system, please take a minute to report it like I already did. Thank you.
EDIT: This has been, apparently, fixed on the new iPadOS.