why not to use passive voice in commit?

I am not a native English speaker. I have a question about the commit message. I would like to use passive voice in some situations.

I think it is reasonable enough to use passive voice in some commit. But I find some projects do not allow to commit messages with passive voice. Why is it?

I google it, and I only find the rules themselves. But no one explains the reason for the rule.

Thanks for any hints.

1. softwareengineering.stackexchange.com || english.stackexchange.com may be more relevant locations for question
2. Any rules are result of accepted agreements (or habits of rule-maker in case of dictatorship environment)

In common case active voice is preferred, because (by agreement) commit-message describe not "what was done" by committer, but "what must to do" changed code.

But, anyway, you can follow any style, as long as it does not interfere with the rest team