An upstream change appears to have broken frame indexing syntax, as used here within an icon size loop. The fix is to use the built-in batch mode to convert setting a variable for the icon size.
convert ico:CorsixTH/CorsixTH.ico[2] corsix-th.png https://github.com/ImageMagick/ImageMagick6/commit/02023b057fbceb60df963612d42bab2f311de67b
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