Summary: I have finished postdoc #1 (it was negative experience) and started postdoc #2. I have been invited to present work performed during postdoc #1. Is it normal and expected, since it will take away time from my current job?
I have finished a postdoc a few months ago. It wasn't a pleasant experience both from a perspective of human relationship with my supervisor (a fake, hypocrite, toxic and stressful person/experience, nothing like I had faced before in my whole life) and from a research project (too little challenged mentally, left alone most of the time, and badly managed: set to work on non priority tasks most of the time). I will start another postdoc in a few months, in another research group, in another city, in another topic (which I personally find much more interesting).
However, I have been contacted by the 1st postdoc research group, asking me whether I would attend to a conference, to present some of our work. This would be for a few days during the 1st month of my 2nd postdoc, which would start in a few months from now. On a personal level, I do not think it would help me much to present this work (I am not involved in this topic anymore), I would rather work in the new laboratory (every working day will be extremely precious and valuable, since there aren't many). If I were to attend the conference, it would mean the 2nd postdoc would have to pay me a full salary while I would be "working" for the other laboratory.
I would rather not give more details, at least for now. I am wondering whether it is common for people doing several postdocs, to "work" for previous postdocs, or attend to conferences related to previous postdocs, while it removes working time in the new postdoc.