I saw this glitch from the time I upgraded to 1.15 yesterday. The problem is that the right hand of my player moves two times when I right click and place a block, I have an internet connection with normal speeds which do not change i.e. 1Mbytes/sec plus, so I think there is not any problems with my network, and as it also appears everytime. The hand of my player doesn't shake two times when I break a block.

-It's only get when i play multiplayer ( I use host like server.pro, freemcserver.net,...) It's don't get when I run server from my computer !
-It's only get when I use version 1.15 server hosting
-It's get in Survival,Creative,.....
link video: https://www.youtube.com/watch?v=fpmm5Qmf_rY&feature=emb_title