Why should it misbehave? What warning are you talking about?
The only disadvantage for now is, that slideshows aren't responsive in actual Muse. But this is true for slide shows outside of panels and composition as well.
If you can create a small new .muse file with just the error causing slideshow and share it with us via Dropbox or WeTransfer, it will be very helpful for us to troubleshoot the issue.
It should be obvious, that a light box within a light box can’t work! Normally, such a construction is useless. But I think, this isn’t your issue. Nevertheless: At this point we should know exactly what you are doing.
You told us, you have a slide show within a tabbed panel. If you put a light box slide show into one panel target, and another light box slide show into the next panel target, all works without any problem. No alert will be shown in this case.
Therefore I assume, that you are doing something else. But what?
Not a light box within a light box. I have a 5-tabbed panel in one page. My intent is to have a slideshow in each tab. That is all I'm doing.
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And exactly that works fine!
If not in your case, give us a .muse file with nothing else but this slideshow/tabbed panel construction (only one image in the slideshow, please) to have a look at: Upload this file to Dropbox or a similar file sharing service and post the download link here. Then we will see …