How did the door lose it's simple collider?

In this video we saw the door doesn’t have a collider anymore and we had to again add a box collider to it. He said it is a problem caused by version control system since we chose to ignore all the Starter Content earlier in .gitignore file. But if git is ignoring those files, the files shouldn’t change no matter what you do in SourceTree. So how did the door lose it’s collider?

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