MathJax3 left curly brace misaligned and not smooth

Created by: MacroUniverse

Hi, I found these two little bugs after switching to MathJax3 (I'm using Chrome browser)

1. The brace is not smooth when there are many lines (html page)
2. The brace is lower than it should be (html page)
3. Also, if multiple & are used for alignment, no error will be reported, but this is not allowed in LaTeX