IamCrazy, +1
Thanks to the history, I figured out how the selection is made :-) Some kind of muddy system:
In order for the selection to appear, markers of the beginning and end of the selection as in Android 2.3, you need to select Select text by a long press on the screen, then tap at the end of the initial selection block (the text block will be highlighted in color, default is orange), then tap at the beginning of the selection block and then markers will appear. Moreover, if you select in the reverse order i. the beginning of the selection is lower in the text than the end, then the markers in this way do not appear.
In general, markers appear once, you need to accurately tap at the beginning of the selection.