Unable to highlight/select textField after filling it with a value using pdf-lib

Question

I want to dynamically update fields inside some pdf files and use them. For the sake of user experience, I want the fields to be able to be highlighted so it's easier to copy/paste so I don't have to input the values later manually... but I have been unsuccessful in finding a solution.

Here's my code that fills out the textFields using pdf-lib:

const pdf = await PDFLib.PDFDocument.load(filedata);
const form = pdf.getForm();

var textField = form.getTextField(TEXTFIELD_NAME);

textField.setMaxLength(20);

textField.setText("Some value");

textField.enableReadOnly();
const pdfToBytes = await pdf.save();

And then I create a file using "pdfToBytes", but when opening the PDF using any PDF viewer, I'm unable to highlight/select the value inside the textField.

I have tried textField.disableReadonly, but I actually want the field to be read only, and it doesn't really work in all PDF viewers when doing so anyways.