See e.g. https://commons.wikimedia.org/wiki/Category:South_Pole_Telescope - because mapframe uses cartesian tiles, it breaks down at the polls, and displays whitespace below and massively distorts the lowest/highest latitudes.
I posted this in the 2019 wishlist, but withdrew it as I realised that it's not actually possible to edit the maps at the poles on OSM as they use the same projection - so this probably needs OSM to fix things first. Not sure if it's possible to mark another organisation as the blocker for this issue!
IIRC, OSM can store polar regions just fine, but it is the OSM's own rendering that causes problems. Wikipedia does not use OSM's renderer, but it is similar in structure.
Note that Vega <graph> tag can render non-mercator projections too, and it can get the data from the geoshape service - which downloads the data from the OSM. In other words, you can get the outline of antarctica and draw it. This should already be available - one would just need to design this graph using the <graph> tag.