`overline` doesn't work as expected

[lsloan]

Using other latex viewers, when I enter the code 9.\overline{123}, I get the result "9.1̅2̅3̅". However unicodeit gives "9.1̅3}". It seems to be a parsing mistake. I tried shorter strings within the braces and found that the right brace always seems to replace the second character:

• 9.\overline{1} → 9.1̅
• 9.\overline{12} → 9.1̅}
• 9.\overline{123} → 9.1̅3}
• 9.\overline{1234} → 9.1̅34}