message filter dropping: frame "base_link" at time xx for reason 'unkonwn'

[Un1Lee]

hello, thank your work so much. I run fast_lio2 for mapping, and change it to your mapping format. then I run fastlio2 for odom, for example, it will publish tf: odom->base_link. then I run your code, for global_frame_id :map, base_frame_id: odom, odom_frame_id:odom.

It seems that rviz show maybe ok? but the terminal always report: message filter dropping: frame "base_link" at time xx for reason 'unkonwn'.

if I change the fixed frame from map to base_link, it won't report, but I think the fixed should be map? can you give me some help? Thank you! I don't know it is good to report such message filter .