Custom board backgrounds don't show up in puzzles or studies

Heyas all! I set a custom board background, which appears during games and previews, however when I'm doing a game study, or trying out a puzzle, it seems to not load

Are those boards unique from others somehow? (Or is this a bug..?)

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So! An update on this! It turns out what's getting me was CORS!

If you were to set "pbs.twimg.com/media/Ft0PzuiakAAcXiF?format=jpg&name=orig" as your board background, you can see that it loads in most locations~ However, if you go into puzzles, a CORS error is thrown into the console

This seems to be because it's loaded with LilaController#EnableSharedArrayBuffer(), which sets "Cross-Origin-Opener-Policy: same-origin" on Puzzles, User Analysis, the normal Analyze page, Practice, Relay, and Studies

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Aaaaand, since this is more of a code thing than it is a support one (I think?) I opened an issue on GitHub with significantly more detail~
github.com/WandererXII/lishogi/issues/675

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