[Vanilla Bug] FiringFrames are reversed

First Check

[X] I added a very descriptive title to this issue.
[X] I used the GitHub search to find a similar issue and didn't find it.
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Description

Firing frames play in reverse. The FiringFrames= and StartFiringFrame= keys otherwise work correctly.

Attached are two gifs, one from in-game and one from the shp builder, demonstrating the reversedness in action.

Required Code (optional)

No response

Steps To Reproduce

The only unit in vanilla Tiberian Sun which uses the FiringFrames tag is the Wolverine. The issue is not as visible here because the firing frames look pretty much identical backwards and forwards and only last 4 frames.

I have attached a version here which numbers the frames in the shp so that it's easier to track, though a low speed is necessary.