Hi Andrew,
I reproduces this behavior on the following
Dojo snippet, It is caused by not having the image loaded initially when the tooltip becomes visible. When the image is loaded, tooltip spans out of the bottom of the screen. I am afraid that there is no workaround for this scenario. Only setting tooltip height prevents this behavior. It would be helpful if you provide a Dojo snippet of your scenario to check if there is a possible workaround for it.
Regards,
Dimitar
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