Spelling with hunspell-nl dictionary results in error E201 Invalid value #776

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Environment

• Ubuntu 22.04.3 LTS
• Vale installed from PyPI with pip3 install -U vale
• Vale 3.1.0

Describe the bug / provide steps to reproduce it

I wrote the following rule to add Dutch spelling:

extends: spelling
message: "Bedoelde je echt '%s'?"
level: error
dicpath: /usr/share/hunspell/
dictionaries:
  - nl

I installed the hunspell-nl package (sudo apt install hunspell-nl), which is created by the OpenTaal project.

After running Vale on a Dutch text with this rule enabled, I get the following error:

E201 Invalid value [/home/koan/vale/Koen_NL/spelling.yml:1:1]:

   1* extends: spelling
   2  message: "Bedoelde je echt '%s'?"
   3  level: error

CrossProduct is not Y or N: got "0"

Execution stopped with code 1.

When I change the dictionary to en in the spelling rule, running Vale succeeds, so there's something in the Dutch dictionary file that makes it fail.