Depending on the exact parsing strategy it might be genuinely required (such as if the parser switches from "property mode" to "rule mode" at some point), but i

Depending on the exact parsing strategy it might be genuinely required (such as if the parser switches from "property mode" to "rule mode" at some point), but in this case it was just because it's kinda confusing to do so. We removed the restriction, but still warn against it due to readability issues.