Focusable=false was only ever half the fix, and its remark now says so:
Avalonia's focus stays on the NativeWebView, but the touch that presses
a key still hands Android's native focus to Avalonia's input view — the
platform moves it before Avalonia decides anything. The WebView's input
connection dies with it, the keyboard swaps to its no-input layout, and
the inset churn parks it over the very row that was tapped.
Each key now returns that focus once its byte is on the wire, through a
sibling of SoftKeyboard that walks the decor view to the one WebView
this application has. Free when nothing moved. Check 11.10a is the
phone-in-hand proof.