Please note that creating a project's first subproject moves all members to become members of the subproject instead. Just making sure you are aware of that.

I think this should be a regular component project, and all of them should
be restructured the same way as described in T137816

In T138457#2406585, @Yurik wrote:

I think this should be a regular component project

Then I'm not sure why the task description says:

This is a subproject of Maps.