How often will a dissector be started at loading a pcap-file?

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Thanks, that helps me. Yes the dissector's protocol is in the first packet. I use a pcap with only 12 packets of the specific protocol inside to test the dissector. If wireshark always runs twice in the order of entry, I can use it for my project. I wonder why it makes the third run. I tried several times to load the file. Some times wireshark made the third run only at some packets. But that isn't an issue for me.

Note the other part of my answer:

a dissector is subsequently called when a packet containing the dissectors protocol is displayed in the packet details by selecting a packet in the packet list.

As the first packet in the list is automatically selected after capture file load, any dissector for protocols in the first packet will be called again. And selecting any other packet at any time will run all dissectors for that packet.

I tried it on my private Mac. There it only runs twice for every packet and if I select one, like you described.

I printed out for every packet this way: function pBap_protocol.dissector(buffer, pinfo, tree) print("pinfo.number:" .. pinfo.number) ...

On my working laptop it runs three times at loading and if I select a packet. Don't know why. May be it's an older version on my working laptop. But that doesn't bother me.