XPath 2 expression in String causes error message

I am using XPath 2 in a java program. Idea complains about the commas here:

String exp = """
(/*[@something]//a,
 /*[@something]//b,
 /*[@something]//c)
""";

The expression is valid and this compiles with gradle (jdk 17).

Alt+Enter offers no way to turn off the error message, that I can see. Oddly, this avoids the error message:

String exp = String.valueOf("""
(/*[@something]//a,
 /*[@something]//b,
 /*[@something]//c)
""");

Do you think this is a bug? Any suggestions on how to make IDEA accept the first string?