When using Samsung's keyboard, I selected a section of text which contained a reference and pressed a character on the keyboard.

Expected behaviour: The section of text is replaced, in one step, with the character

Actual behaviour: The section of text is deleted, as well as a chunk of the following text. The character is inserted. Hitting undo once reverts to a state where the paragraph is missing and the character has not been inserted. A second undo restores the initial state.

See also: T411009: Can't delete paragraph ending in a reference on Android, which I was attempting to debug when I found this.