The HE (I'm using 3.1.3 non-RTX) will exhibit errors and eventually crash if a large number of entities is created through the scripting interface.
Some gui elements (such as the Send Packet -> Entity Control) show the correct entity list. Other gui elements (such as the main entities list) exhibit errors; only a partial list is displayed.
Additionally, only some of the entities are sent to the IG.
Example script and entities.def are attached.
test script
entities.def for test script