When creating pages in various spaces, labels are created and are uniform across projects/spaces/etc. Regardless of what labels are used, when searching by label, nothing is found ever - not for that space or any other. Essentially labels are not being recognized at all.
Indeed it seems like an unexpected behavior. I suggest you to look at your Confluence Log (atlassian-confluence.log) and search for some error related to "label". If you find some ERROR or Warning related to that, you can check on https://confluence.atlassian.com for it.
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