I found the problem, it was related to some invalid saved object. Not sure why it affected lens visualization only and why I could create other types of visualizations. I noticed the problematic object when I opened saved objects, it had a strange name and it was caused by invalid syntax in json file on importing some index. Anyway, this problem doesn't seem to be related to permissions or upgrade of ELK, it is just invalid object in my setup. It was tricky to figure out what causes the problem.
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