"mesh=" juypter vs. -notebook

edit

Perhaps I should send this to some devel or support group ?
Starting command line:

sage -notebook

Comes up and executes:

var('x,y')
plot3d(sin(x-y)*y*cos(x),(x,-3,3),(y,-3,3), mesh=True)

Correctly.

Whereas:

sage -n jupyter

Fails with miscellaneous assertion type errors. sagemath 7.3 in both cases.
A friend also point out the option "color='yellow' " also fails in jupyter.

Edit (slelievre): I confirm I can observe this also with Sage 7.4. Here is the error message I get:

---------------------------------------------------------------------------
AssertionError                            Traceback (most recent call last)
<ipython-input-3-44b2387a145a> in <module>()
----> 1 plot3d(sin(x-y)*y*cos(x),(x,-Integer(3),Integer(3)),(y,-Integer(3),Integer(3)), mesh=True)

/opt/s/sage-7.4/local/lib/python2.7/site-packages/IPython/core/displayhook.pyc in __call__(self, result)
    244             self.start_displayhook()
    245             self.write_output_prompt()
--> 246             format_dict, md_dict = self.compute_format_data(result)
    247             self.update_user_ns(result)
    248             self.fill_exec_result(result)

/opt/s/sage-7.4/local/lib/python2.7/site-packages/IPython/core/displayhook.pyc in compute_format_data(self, result)
    148 
    149         """
--> 150         return self.shell.display_formatter.format(result)
    151 
    152     # This can be set to True by the write_output_prompt method in a subclass

/opt/s/sage-7.4/local/lib/python2.7/site-packages/sage/repl/display/formatter.pyc in format(self, obj, include, exclude)
    158         # First, use Sage rich output if there is any
    159         PLAIN_TEXT = u'text/plain'
--> 160         sage_format, sage_metadata = self.dm.displayhook(obj)
    161         assert PLAIN_TEXT in sage_format, 'plain text is always present'
    162         if sage_format.keys() != [PLAIN_TEXT]:

/opt/s/sage-7.4/local/lib/python2.7/site-packages/sage/repl/rich_output/display_manager.pyc in displayhook(self, obj)
    764         self._backend.set_underscore_variable(obj)
    765         plain_text, rich_output = self._rich_output_formatter(obj, dict())
--> 766         return self._backend.displayhook(plain_text, rich_output)
    767 
    768     def display_immediately(self, obj, **rich_repr_kwds):

/opt/s/sage-7.4/local/lib/python2.7/site-packages/sage/repl/rich_output/backend_ipython.pyc in displayhook(self, plain_text, rich_output)
    525             from sage.repl.display.jsmol_iframe import JSMolHtml
    526             jsmol = JSMolHtml(rich_output, height=500)
--> 527             return ({u'text/html':  jsmol.iframe(),
    528                      u'text/plain': plain_text.text.get_unicode(),
    529             }, {})            

/opt/s/sage-7.4/local/lib/python2.7/site-packages/sage/repl/display/jsmol_iframe.py in iframe(self)
    259             </iframe>
    260         """
--> 261         escaped_inner_html = self.inner_html().replace('"', '&quot;')
    262         iframe = IFRAME_TEMPLATE.format(
    263             script=self.js_script(),

/opt/s/sage-7.4/local/lib/python2.7/site-packages/sage/repl/display/jsmol_iframe.py in inner_html(self)
    235         """
    236         return INNER_HTML_TEMPLATE.format(
--> 237             script=self.js_script(),
    238             width=self._width,
    239             height=self._height,

/opt/s/sage-7.4/local/lib/python2.7/site-packages/sage/repl/display/jsmol_iframe.py in js_script(self)
    193         """
    194         script = [r"["]
--> 195         for line in self.script().splitlines():
    196             script += [r"  '{0}',".format(line)]
    197         script += [r"].join('\n');"]

/opt/s/sage-7.4/src/sage/misc/cachefunc.pyx in sage.misc.cachefunc.CachedMethodCallerNoArgs.__call__ (/opt/s/sage-7.4/src/build/cythonized/sage/misc/cachefunc.c:12716)()
   2399         if self.cache is None:
   2400             f = self.f
-> 2401             self.cache = f(self._instance)
   2402         return self.cache
   2403 

/opt/s/sage-7.4/local/lib/python2.7/site-packages/sage/repl/display/jsmol_iframe.py in script(self)
    156                     command, obj, meshfile = line.split(' ', 3)
    157                     assert command == 'pmesh'
--> 158                     assert meshfile.startswith('"') and meshfile.endswith('"\n')
    159                     meshfile = meshfile[1:-2]    # strip quotes
    160                     script += [

AssertionError: