DecalRenderSystem doesn't render right texture

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Steps to reproduce:

1. Create at least 4 entities with CPosition, CDecal, COrientation with the same Texture "FOO.png"
2. Create one or more entities with another texture "BAR.png"
3. Bug: Now the first 3 entities should have the wrong texture "BAR.png" (spawning more decals with another texture "BAZ.png" makes the first 3 switch to "BAZ.png")

This bug seems to appear only when no previous Decals have been created and removed from the registry.