Unexpected error when reading a valid Ion file

[popematt]

For no apparent reason, ion CLI can read one of these files (gist), but fails when reading the other. There's not a lot of difference between the two files.

The error is as follows:

Error: invalid Ion syntax encountered
        offset=4146
        buffer head=<?
// TODO: set_macros can accept...>
        buffer tail=<...n accept a module/macro export?
>
        buffer len=56
        

Caused by:
    invalid Ion syntax encountered
            offset=4146
            buffer head=<?
    // TODO: set_macros can accept...>
            buffer tail=<...n accept a module/macro export?
    >
            buffer len=56

I was not able to come up with a smaller reproducible example because if I remove any one of the top-level values from the bad_test_case.ion file, the error seems to goes away. In addition, if I add any scalar value or IVM to this line, that also makes the problem go away, but if I add a container value there, it doesn't make the problem go away.

I am using Ion CLI v0.9.1.