Mactrix drops last letter of message from xhain bot.

[steely-glint]

Thanks for your good work on Mactrix!

I've been using it and noticed what I assume is a rendering bug.

At the top you can see that Mactrix drops the last letter of each of the bot's messages.
Underneath you can see Element correctly rendering xhain's xhain_is_open room .

I have not noticed this behaviour on any other rooms.

Please let me know if I can run tests to help you fix it.