Dynamic text vertical positioning issue

[Ahanu Banerjee]

In the following example, dynamic text does not vertically reposition when
"+" marking (i.e., left-hand pizzicato) is given vertical offset. Please
advise if I have missed an obvious solution. Thanks!

\version "2.20.0"
{
  % dynamic text has wrong vertical position:
  \stemDown e'-\tweak extra-offset #'(0.3 . 1.5) _+ \p
  % expected behaviour:
  e'_1\p
}