Add tf to existing bag file

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I have created a ros node that does a tf transformation. I want to merge this new frame to an already existing bag file. I did this with rosbag record -a. (Played the existing bag and my ros node doing the transformation). But now I get the warning: ""detected jump back clearing tf Buffer" when I play the new bag. Is there anything I have to consider when merging a frame?

Done: -> Set use_sim_time true before recording -> playbag exisiting bag file with Argument --Clock