In the below screenshot, the triangular +3v3 plane was attempted to be added
I added in the triangular shape associating it with net 3v3.
Ground plane did not change. The triangle shape was still there and connected to 3v3 but no change in green copper.
From the above I named the area “heatspreader” and saved it.
Pressed “b” and what you see in the photo is how the copper ended up. The triangle is still associated with net 3v3 but somehow Kicad thinks it’s something else.
Application: KiCad PCB Editor
Version: (5.99.0-10027-g0561ce903e), release build
libcurl/7.74.0-DEV Schannel zlib/1.2.11
Platform: Windows 10 (build 19041), 64-bit edition, 64 bit, Little endian, wxMSW
Date: Mar 28 2021 12:09:42
wxWidgets: 3.1.4 (wchar_t,STL containers)
Compiler: Visual C++ 1928 without C++ ABI