Swift @objc(<name>) broken in extensions

Sensor.swift

@objc(LRSensor)
public class Sensor: NSObject {
    
}

public extension Sensor {
    
    public var test: String {
        return "Hello!"
    }
}

Target-Swift.h

SWIFT_CLASS_NAMED("Sensor")
@interface LRSensor : NSObject
- (nonnull instancetype)init OBJC_DESIGNATED_INITIALIZER;
@end


@interface Sensor (SWIFT_EXTENSION(LocoRoboAPI))
@property (nonatomic, readonly, copy) NSString * __nonnull test;
@end