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(I used the field processing loop from EASYPOST.lua )
To add a bytes field to the tree, specify the tvb:
11.7.1. TreeItem

11.7.1.2. treeitem:add([protofield], [tvbrange], [value], [label])

            subtree:add(rawMessage, v.tvb)

If you just to want a string displaying the value then define the field as a string not bytes.

local msgData = Field.new('btcommon.eir_ad.entry.data')

local bgNotificationData = Proto('bgadv', 'Background Notification Data')

local rawMessage = ProtoField.bytes('bgadv.data')

bgNotificationData.fields =
{
    rawMessage,
}

function bgNotificationData.dissector(tvb, pinfo, tree)
    local subtree = nil

    -- copy existing field(s) into table for processing
    finfo = { msgData() }

    if (#finfo > 0) then
        if not subtree then
            subtree = tree:add(bgNotificationData, btMsgData, "Message Data")
        end
        for k, v in pairs(finfo) do
            -- process data and add results to the tree
            subtree:add(rawMessage, v.tvb)
        end
    end
end

register_postdissector(bgNotificationData)