Indeed, the figures need to be rendered by Matlab in order to make screen captures.
There are other solutions than using bst_report('Snapshot').File > Save snapshot or function out_figure_image.m:
function varargout = out_figure_image( hFig, imgFile, imgLegend)
% OUT_FIGURE_IMAGE: Save window contents as a bitmap image.
%
% USAGE: img = out_figure_image(hFig) : Extract figure image and return it
% out_figure_image(hFig, imgFile) : Extract figure image and save it to imgFile
% out_figure_image(hFig, 'Viewer') : Extract figure image and open it with the image viewer
% out_figure_image(hFig, figFile) : Save figure as a Matlab .fig file after removing some callbacks
% out_figure_image(hFig, 'Figure') : Copy figure and removes callbacks
% out_figure_image(hFig) : Extract figure image and save it to a user selected file
% out_figure_image(hFig, ..., imgLegend)
% out_figure_image(hFig, ..., 'time')
% @=============================================================================
% This function is part of the Brainstorm software:
% https://neuroimage.usc.edu/brainstorm
%
% Copyright (c)2000-2020 University of Southern California & McGill University
% This software is distributed under the terms of the GNU General Public License
% as published by the Free Software Foundation. Further details on the GPLv3
% license can be found at http://www.gnu.org/copyleft/gpl.html.
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