So two suggestions on this:
1. Have you tried doing a capture to a pcap file instead of to the display to see if it makes any difference? Are you seeing the traffic on the device connected to that mirror destination port?
2. I had a similar issue to this with one of our Meraki switches where I couldn't see the mirror traffic in a capture either because the ports weren't in the same asic (maybe wrong terminology there). I can't remember how many ports are grouped together in an asic (maybe 16) but basically, I had to make sure the source and destination ports were in the same asic for it to work properly.
Adam R MS | CISSP, CISM, VCP, MCITP, CCNP, ITILv3, CMNO
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