when you enable Experiment_MCDiscordReserializer_ToMinecraft it translates pings from the discord chat to the minecraft chat to for example <@!249638347306303499| instead of @sab

this issue wasn't closed after it was merged but this still happens when there is a space after the mention

i'm thinking to fix that make sure there isn't anything before the > to fix it since quotes on discord don't work anyways when there's something before the >