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I do not know how to make this work to be honest, so I usually have a workaround.

I do it with a message_filters::Cache.

Cache your /scan, if everything was smooth then a queue of (25/3) would be enough, but I would go for 100 messages at least.
In your /localizer_pose callback, you can retrieve the latest message from the /scan cache with getLatestTime(). You can also retrieve the latest message before a given timestamp.

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