I had this multiple times in the past. This time it is Header P11.
If i move P11 out of the board outline copper area fill is working like it should.

After placing P11 on the PCB the copper fill stops working.

Strangly when enabeling the island they still apear but the rest of the fill does not exist.

Vivaldi
1.93.955.48
Windows
10
EasyEDA
5.8.20