FYI, most narrow-wide chainrings need replacement if you have changed a cassette due to wear. If you get two cassettes out of one chainring, that is considered reasonably good.

Their cumulative wear usually results in noisy operation, or in more extreme cases, a chain not releasing smoothly...same as it ever was. Component wear manifests as skipping on the rear, and typically as failure-to-release on the front, unless it's simply good and roached.