Field in template-pdf not updated?

[Rapid1898-code]

Hello - i try to update a fields in a pdf-files using the following code:

import pymupdf

doc = pymupdf.open("templ.pdf")

print("Before")
for pageNr, page in enumerate(doc):
  for field in page.widgets():
    if field.field_name == "fieldL1":
      print(field.field_value)

for pageNr, page in enumerate(doc):
  for field in page.widgets():
    if field.field_name == "fieldL1":
      field.field_value = "New Entry" 
      field.update()    

print("\nAfter")
for pageNr, page in enumerate(doc):
  for field in page.widgets():
    if field.field_name == "fieldL1":
      print(field.field_value)

doc.bake(annots=True, widgets=True)
doc.ez_save("test.pdf", garbage=3, deflate=True)
doc.close()

As you can see in the log the field should be updated fine but when i output the new-pdf the fields is not changed.
Why is that?

Initital Template:
templ.pdf

Output-File without changed field:
test.pdf

[Rapid1898-code]

One addtional remark to my question -
I realized that the upate works fine on one of my computer - but not on anyother computer (both windows).
Are there any prerequisites so the update is working?

[JorjMcKie]

Please investigate the differences between the two machines: PyMuPDF versions especially.