[Python] Document AI not returning tax_rate

I am trying to use the Invoice Parser Processor of Document AI. The problem is that I am not getting the tax_rate field in the response when I use the API in my code. However, when I upload the same invoice in the "try docai" web the tax_rate is always returned.

This is my code to make the API call

# Initialize the client
client_options = {"api_endpoint": f"{location}-documentai.googleapis.com"}
client = documentai.DocumentProcessorServiceClient(client_options=client_options)

# The full resource name of the processor
name = client.processor_path(project_id, location, processor_id)

# Read the file into memory
with open(file_path, "rb") as pdf_file:
pdf_content = pdf_file.read()

# Load the input document
raw_document = documentai.RawDocument(
content=pdf_content,
mime_type=mime_type
)

request = documentai.ProcessRequest(
name=name,
raw_document=raw_document
)


And this is the vat info I get in the response

text_anchor {
text_segments {
start_index: 445
end_index: 451
}
}
type_: "vat"
mention_text: "900,00"
confidence: 1
page_anchor {
page_refs {
bounding_poly {
normalized_vertices {
x: 0.277810812
y: 0.455004215
}
normalized_vertices {
x: 0.332540154
y: 0.455004215
}
normalized_vertices {
x: 0.332540154
y: 0.465517253
}
normalized_vertices {
x: 0.277810812
y: 0.465517253
}
}
}
}
id: "0"
properties {
text_anchor {
text_segments {
start_index: 445
end_index: 451
}
content: "900,00"
}
type_: "vat/amount"
mention_text: "900,00"
confidence: 0.501076162
page_anchor {
page_refs {
bounding_poly {
normalized_vertices {
x: 0.277810812
y: 0.455004215
}
normalized_vertices {
x: 0.332540154
y: 0.455004215
}
normalized_vertices {
x: 0.332540154
y: 0.465517253
}
normalized_vertices {
x: 0.277810812
y: 0.465517253
}
}
}
}
id: "1"
normalized_value {
text: "900"
}
}


NOTE: The invoice is in Spanish and I have not been able to set the language. However, I have read somewhere that the language is automatically detected.

How can I obtain the tax_rate when calling the API?

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