The only possibility I see here is that this is a Windows 10 system with an older SSHD if mobaxterm doesn’t work anymore as there were some changes on which SSHD executable XPipe will use for mobaxterm.

About the X11, I am not aware of any changes that could change that behaviour. If no parent connection of the LXC container has that explicitly enabled, it shouldn’t use that.

For both issues, feel free to post on GitHub and Discord and I can help troubleshoot this