P-51H-5-NA's gunsight does not work

The gunsight present inside the cockpit of the P-51H is non-functional. The lead indicator is static inside the gunsight despite the fact on other aircraft it moves with the aircraft. Most likely just an overlooked/unreported bug.

The images with the moving reticle are on the P-51D-20-NA
The images without the moving reticle are the P-51H-5-NA