pdftk breaks form fields

Using the command
pdftk charSheet.pdf burst
causes form fields to become fragile in the output files, meaning that any attempt to add more text to a field causes the field to become invisible. The data seems to still be there; it is just not displayed after clicking outside the field.

Example:
Original pdf: charSheet.pdf (I filled in a field, CHARACTER NAME on p. 1, in evince.)
ran command: pdftk charSheet.pdf burst
output pdf: pg_0001.pdf This file still shows the filled-in field CHARACTER NAME. So, in evince, if I try to add text to the same field, and then click away from the field, it's invisible. Also, adding text in other fields behaves the same way. If I save a new pg_001_edited.pdf, and reopen, the field is invisible, but the filled-in data is there.

I'm using:
Ubuntu 16.04 (64 bit)
pdftk 2.02
GNOME Document Viewer 3.18.2

I will attach the referenced files. Thanks!