It looks like when Linus Walleij created his PETSCII to Unicode table he made an off-by-one error and that mistake made it into your codec tables.
He defines 0x60 as follows:
0x60 0x2501 #BOX DRAWINGS LIGHT HORIZONTAL
However, "box drawings light horizontal" is 0x2500. (The code point 0x2501 is "box drawings heavy horizontal.") See the Wikipedia article on Box Drawing Characters for details.
Other projects also use 0x2500 for this code point.
It looks like when Linus Walleij created his PETSCII to Unicode table he made an off-by-one error and that mistake made it into your codec tables.
He defines 0x60 as follows:
However, "box drawings light horizontal" is 0x2500. (The code point 0x2501 is "box drawings heavy horizontal.") See the Wikipedia article on Box Drawing Characters for details.
Other projects also use 0x2500 for this code point.