New Block: Columns not Rendered in Packet List until rescan

[Paul Offord <Paul.Offord () advance7 com>]

I've written a new block dissector called blocktype-trb - see https://code.wireshark.org/review/#/c/26203/  It works OK 
but I have a strange problem.

I've added a profile for the new dissector that adds trb columns into the packet list.  With this profile active I load 
a pcapng file with trb blocks and get this:

[cid:image005.jpg@01D3B254.879DF770]

If I then do anything to cause a rescan (in this case change to Default profile and then back to my customer profile), 
the columns are populated:

[cid:image006.jpg@01D3B254.879DF770]

Any ideas what I have missed?

Thanks and regards...Paul

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