Curly bracket escape issue in Children Query Parser

During query tests, I discovered a curly bracket escape issue with the Children Query Parser.

I created a new collection with _default config set, then I uploaded these documents:

documents.txt

The execution of this query

({!child of=": -nest_path:*"}+name_s:"parentName001") AND name_s:"childName001"

is OK, but this one

({!child of=": -nest_path:*"}+name_s:"parentName{002}") AND name_s:"childName002"

returns an Exception:

Cannot parse '+name_s:"parentName': Lexical error at line 1, column 20.  Encountered: <EOF> after : "\"parentName"

I attached the full stack trace.