It appears that Tumblr's code will expect --accent to be a color rather than a numerical triplet, and also that it may or may not make sense to override it in this extension (we'll have to see what it's actually used for). In either case, setting it to a numerical triplet is probably bad news. This therefore removes its override.
As per my comment here: https://github.com/AprilSylph/Palettes-for-Tumblr/pull/185#issuecomment-2134525907
It appears that Tumblr's code will expect
--accentto be a color rather than a numerical triplet, and also that it may or may not make sense to override it in this extension (we'll have to see what it's actually used for). In either case, setting it to a numerical triplet is probably bad news. This therefore removes its override.