Reference import incorrectly outputs @media mixin calls

[Tahakk]

Bug: Reference imports with mixin calls are incorrectly output

Environment

• less.js version: 3.13.1
• less.php version: 5.5.0
• PHP version: 8.4

Minimal Reproduction
style.less:

.mq-max(@max; @rules) {
	@media only screen and (max-width: (@max - 1)) {
		@rules();
	}
}

@import (reference) 'control.less';

controls.less:

.btn {
	color: red;

	.mq-max(1420px, {
		color: green;
	});
}

.btn {
	color: blue;

	@media only screen and (max-width: 1419px) {
		color: yellow;
	}
}

Expected Output (like less.js)

/* empty, because reference imports do not output anything */

Actual Output (less.php)

@media only screen and (max-width: 1419px) {
	.btn {
		color: green;
	}
}

Additional Notes

• When a mixin is defined in a reference-imported file it is ignored (correct behavior).