Cause of this issue is that Custom Node Sockets info type was
initialized as SOCK_FLOAT when registering. Areas within the core that
would ignore custom socket types by checking its type would use the
socket as being a float type.
When custom node sockets have a property called default_value blender
tries to store it as an internal default value what failed in debug
builds.
This patch will set the socket type to SOCK_CUSTOM when registering a
custom socket type and allow, but skip storage of custom default values.
In this case the default values should already be stored as custom
properies.
Reviewed By: campbellbarton, JacquesLucke
Maniphest Tasks: T89260
Differential Revision: https://developer.blender.org/D13174
a5c59fb90e