Discord ShowJoinPart will repeat message to Discord

[jdarwood007]

Describe the bug I have this setup with 2 IRC servers and a Discord server bridging channels. The config has the option to show join/parts setup for all 3 (ShowJoinPart=true)

What happens is when a user joins Discord, the message is broadcasted to all IRC channels, which then broadcasts back to discord on all channels. The discord message appears as such:

<system@Discord> User joins

To Reproduce

1. Configure bridge between multiple IRC and discord channels with ShowJoinPart set to true on all.
2. User joins Discord.
3. Message is broadcasted to IRC channels
4. Message is broadcasted to Discord related channels from IRC bot.

Expected behavior If discord is broadcasting a user has joined the server to IRC, it should not be repeated back over the bridge to the IRC connected channels

Environment (please complete the following information):

• OS: Centos
• Matterbridge version: 1.22.1
• If self compiled: N/A, using matterbridge-1.22.1-linux-64bit from releases

Additional context Snippet of config

[irc]
    [irc.Freenode]
    Server="irc.freenode.net:6697"
    UseTLS=true
    Nick="BridgeBot"
    RemoteNickFormat="<{NICK}@{BRIDGE}> "
    ColorNicks=true
    UseSASL=true
    NickServNick="BridgeBot"
    NickServPassword="BridgeBot"
    IgnoreNicks="BridgeBot system@Discord"
    ShowJoinPart=true

    [irc.Libera]
    Server="irc.libera.chat:6697"
    UseTLS=true
    Nick="BridgeBot"
    RemoteNickFormat="<{NICK}@{BRIDGE}> "
    ColorNicks=true
    UseSASL=true
    NickServNick="BridgeBot"
    NickServPassword="BridgeBot"
    IgnoreNicks="BridgeBot system@Discord"
    ShowJoinPart=true

[discord]
    [discord.Discord]
    Token="########"
    Server="##########"
    RemoteNickFormat="<{NICK}@{BRIDGE}> "
    IgnoreNicks="BridgeBot IRC system@Discord"
    ShowJoinPart=true