[X:CE 0.34.2] Transparent destroyed state graphics when driving over crushable spectres

[Policenaut]

Working on the Tropical/Swamp tileset and the Xenonauts Fix Pack made me discover that spectres which use walltype="crushing" will become permanently transparent in their destroyed state when driving over them with vehicles. Adding isCover="1" to the effected spectre will fix it but disables the transparency while mousing over/standing next to the spectre , which is useful for larger and more obscuring spectres. 

If needed I can take comparison screenshots for extra clarity.