new iPhone XR, iOS 12.1

when you want to extract a portion of a long post when quoting, it’s impossible to select more than one word to highlight (color, bold, etc) or delete ... as soon as you try to extend the selection, it automatically selects from the cursor to (near) the end of the original quote ... and more often than not the selection disappears entirely

actually, as I just discovered in revising the above problem description, this isn’t limited to quotes

moreover, autocorrect only shows the suggested option for half a second or so and then disappears