Editor: History Shows Black Screen When Page Has Unsupported Block

Expected

Pages with an unsupported block show a dialog or an error when viewing history. Ideally, history would still be viewable even with pages with an unsupported block.

Observed

Pages with an unsupported block show a black screen and crash when viewing history. On a real device, the black screen is shown indefinitely. On an emulated device, the black screen is shown momentarily then the Pages screen is shown. See the animation below for illustration.

Reproduced

1. Tap My Site tab in bottom navigation.
2. Tap Pages item under Publish section.
3. Notice Pages screen is shown.
4. Tap any page with unsupported block.
5. Tap ellipsis/overflow action in app bar.
6. Tap History item in menu.
7. Tap any history item in list.
8. Notice black screen and crash.
9. Notice Pages screen is shown.

Tested

Google Pixel 5 on Android 11.0.0 with WordPress 18.9-rc-1
Google Pixel 2 on Android 10.0.0 with WordPress 18.9-rc-1

Start by reproducing the reported flow from the Pages screen through a page's History item, using the listed Android versions as context. Trace how a page containing an unsupported block is rendered in history; done means history no longer produces an indefinite black screen or crash and instead remains viewable or shows an error dialog.