A workaround seems to be to add a text element to the top copper layer first.
Please see:
[https://easyeda.com/forum/topic/Auto-Router-stop-working-after-adding-text-on-TopSilkLayer-bd595a4a389147bdadb0b1755748f55c](https://easyeda.com/forum/topic/Auto-Router-stop-working-after-adding-text-on-TopSilkLayer-bd595a4a389147bdadb0b1755748f55c)
Chrome
80.0.3987.117
AndroidOS
9
EasyEDA
6.3.22