@DarrenOC sorry I forgot to mention that I did check the sfp transceivers' laser from an angle (I didn't look directly inside just like you recommended), as well as when the fiber cable was plugged in on one end. Light passes through, and I made sure the opposite side inside the switch with the sfp transceiver didn't have light in it (so light into no-light). Bizarre for me, these cables and transceivers are all brand new out of the bag/box.
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