When the text in a table cell uses a World-Ready composer and is underlined, the underlining in the last line is out of position. The invisible end-of-cell mark is underlined, but the first character in the line is only partially underlined. The workaround I've been using is to add a nonjoiner character at the beginning of the line. Doing so shifts the underlining into the correct position.

1. Adobe InDesign 18.2.1
2. Type enought text in a table cell to fill at least two lines; justify it with either of the World-Ready composers; underline the last line of text.
3. Underlining should begin under the left-most character and stop before the invisible end-of-cell marker.
4. Underlining is shifted a couple points to the right.