This appears to be since version 8.1. In src/sage/plot/plot.py there is
.. warning::
If ``plotjoined`` is ``False`` then the axis that is in log scale
must have all points strictly positive. For instance, the following
plot will show no points in the figure since the points in the
horizontal axis starts from `(0,1)`. Further, matplotlib will
display
a user warning.
::
In the html docs, the `(0,1)` now appears literally as \((0,1)\), i.e. no
math typesetting.
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