Well, look's like 2018 version is going old-fashioned avatar pictures, i'm guess...
(This is old version, it's old-fashioned)
While new update, I have my New Avatar picture, see...
(New avatar version, much better and very useful)
In 2018 version, this resolution is 1280x1280, my file size is 61.2kB and some drawing error.
In latest version, new avatar picture that my resolution is 512x512, file size is smaller than 24.9kB which is improved and no drawing errors.
(I'll see you're next time...)