Unable to decode MCPTT Media Type field

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Hi all

I am using this external lua script to decode a pcap containing MCPTT packets. For some reason, the Media Type field is not being decoded properly. In the lowest section you can see the information is there, but it is now being parsed into the proper fields, displaying the file type and size (metadata) instead.

Please see screenshot here.

Any help would be appreciated.

Thanks, Lywarch