getRawTextContent() returns text not found in pdfData.formImage

When I look at the pdfData.formImage object there are no text blocks, but getRawTextContent() returns the strings that I expect to see. I'm not very familiar with how/if the implementation of text extraction differs, so is there a simple explanation for this e.g. the formatting of the pdf, or how do I go about debugging?

pdfData.formImage is something like

{"formImage":{"Transcoder":"pdf2json@1.2.0 [https://github.com/modesty/pdf2json]","Agency":"","Id":{"AgencyId":"","Name":"","MC":false,"Max":1,"Parent":""},"Pages":[{"Height":49.5,"HLines":[],"VLines":[],"Fills":[{"x":0,"y":0,"w":0,"h":0,"clr":1}],"Texts":[],"Fields":[],"Boxsets":[]},{"Height":49.5,"HLines":[],"VLines":[],"Fills":[{"x":0,"y":0,"w":0,"h":0,"clr":1}],"Texts":[],"Fields":[],"Boxsets":[]},{"Height":49.5,"HLines":[],"VLines":[],"Fills":[{"x":0,"y":0,"w":0,"h":0,"clr":1}],"Texts":[],"Fields":[],"Boxsets":[]},{"Height":49.5,"HLines":[],"VLines":[],"Fills":[{"x":0,"y":0,"w":0,"h":0,"clr":1}],"Texts":[],"Fields":[],"Boxsets":[]},{"Height":49.5,"HLines":[],"VLines":[],"Fills":[{"x":0,"y":0,"w":0,"h":0,"clr":1}],"Texts":[],"Fields":[],"Boxsets":[]},{"Height":52.625,"HLines":[],"VLines":[],"Fills":[{"x":0,"y":0,"w":0,"h":0,"clr":1}],"Texts":[],"Fields":[],"Boxsets":[]},{"Height":49.5,"HLines":[],"VLines":[],"Fills":[{"x":0,"y":0,"w":0,"h":0,"clr":1}],"Texts":[],"Fields":[],"Boxsets":[]},{"Height":49.036,"HLines":[],"VLines":[],"Fills":[{"x":0,"y":0,"w":0,"h":0,"clr":1}],"Texts":[],"Fields":[],"Boxsets":[]},{"Height":49.036,"HLines":[],"VLines":[],"Fills":[{"x":0,"y":0,"w":0,"h":0,"clr":1}],"Texts":[],"Fields":[],"Boxsets":[]},{"Height":47.932,"HLines":[],"VLines":[],"Fills":[{"x":0,"y":0,"w":0,"h":0,"clr":1}],"Texts":[],"Fields":[],"Boxsets":[]},{"Height":47.932,"HLines":[],"VLines":[],"Fills":[{"x":0,"y":0,"w":0,"h":0,"clr":1}],"Texts":[],"Fields":[],"Boxsets":[]},{"Height":47.767,"HLines":[],"VLines":[],"Fills":[{"x":0,"y":0,"w":0,"h":0,"clr":1}],"Texts":[],"Fields":[],"Boxsets":[]}],"Width":38.25}}
```

Start by tracing getRawTextContent() and comparing its output with pdfData.formImage.Pages[].Texts in the supplied example. Investigate the PDF text-extraction path and document why text can be returned when those arrays are empty; done when the behavior has a clear explanation or a reproducible correction is identified.