Selfmessages and PrefixContext reveal incorrect numbering

[Peter4825]

When talking to someone you might have the following conversation:

<x> [001] hi
<x> [002] how are you
<me> good
<me> [001] this message is sent using the webif and is a self-message on irc
<x> [004] ok

The self-messages seem to be having their own numbering, while I'd expect those to be correctly numbered in the conversation