[Linker][IW3] Relinking a map results in broken in game rendering

[michaeloliverx]

Relinking an IW3 fastfile using the --load mechanism results in a broken map in terms of rendering. Reproduced using both x86 and x64 builds.

[Laupetin]

Seems to be related to techsets, relinking entirely from in-memory seems to work fine.
The issue is also reproducable with mp_showdown