Old DICOM file loads using `dcm_parse(file; preamble=false)`, but the same file returns `false` when running`isdicom` function

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I am trying to load a directory of DICOM files using dcmdir_parse. Each file in the directory loads when running dcm_parse(file; preamble=false) but loading the directory returns an empty array. While trying to determine the cause, I found that isdicom(file) returns false, but dcm_parse(file; preamble=false) works. Any idea if this is an issue or if I am missing something on my end?