Objects and Units destroyed or killed by fire retain a static burning sprite

[FilmBoy84]

Objects and Units destroyed or killed by fire retain a static burning sprite for some reason This applies even when there is no Line of Sight, as per issue #307

[KometFox]

In my opinion it could be turned as a feature with the appropriate fix so that those glowing "embers" lingers for a while and creates a small decorative smoke before disappearing completely and obviously leaving the corpse intact.

[FilmBoy84]

Another recent example of this bug still existing, also #307 is still an issue but not shown here