Unexpected Token match

[gruebel]

First things first, thanks for the great library ❤️

I'm trying to make sense of a weird behaviour, maybe it is a bug or it works as designed, I hope I will finally find the answer 😄

My current grammar is much bigger, so I was able to reduce it to make it easier to debug, if needed

start: element*

element: value

?value: STRING      -> string
      | reference
      | resource

reference: "reference" "(" value ")"
resource: "resource" "(" value ")"

STRING: /[a-zA-Z_](::|[\w_.])*/

%import common.NEWLINE
%import common.WS_INLINE
%ignore NEWLINE
%ignore WS_INLINE

and the Python code to run it

json_parser = Lark(json_grammar, start="start", parser="lalr")

tree = json_parser.parse(
    """
    reference(resource)
    """
)
print(tree.pretty())

this results in following error

lark.exceptions.UnexpectedCharacters: No terminal matches ')' in the current parser context, at line 2 col 27

        reference(resource)
                          ^
Expected one of: 
	* LPAR

Previous tokens: Token('RESOURCE', 'resource')

am I missing something? Why did the literal "resource" become a Token and why was it matched, even the rule defines an open bracket to be after the literal?

If I define the problematic part in the grammar like this, then everything is fine, but it feels for me unneeded

_RESOURCE: "resource" "("
resource: _RESOURCE value ")"