In v6.4.20.6 when File>Export>DXF is chosen, no options for tracks/silkscreens/etc are given. The exported DXF is not useable.
Here are two images comparing the two exports (ignore the cropped sections of second image):
v6.4.19.4

v6.4.20.6

Chrome
91.0.4472.124
Windows
10
EasyEDA
6.4.19.4