Minecraft join bug?

So does anyone have a solution?

When I join a particular server, I can break down blocks. I can't write anything in the chat. The blocks are mined only with me. That is, I can almost build a house in the lobby, which is no longer there after rejoinen. It seems to be on the server. Does anyone have a solution?

It seems to be on the server.

Then that's just a bad server. Can you do nothing

That could also be the Internet. Do times on the internet if Speedtest. Are there any pages for. If download is under 2 MB / 2000 KB or upload under 1.5 MB / 1500 KB it is no wonder. But it can also be on the server. Try others when the internet is OK…