Commands don't work in the 1.2.6 beta

When I try to do any commands in servers, it doesn't work, I don't know why but I think it's because of my device?? I just think it's because I am in a beta that servers don't support really well, if that is not the case, please fix this problem before you Realese the 1.2.6 version to everyone (including IOS) and thank you for reading this and have a good day.

This bug isn't affecting any of the featured servers

It's effecting the servers that are not partnered with Minecraft