After switching off Advanced SEF for K2, tag filtering still doesn't work and my url looks like "/en/itemlist/tag/Android.html"

I added menu item for K2 tag "Android" with url "mytags", and when I click to the menu item - tag filtering by tag "Android" works. Tag filtering also works for tag "Android" in category list, but it works only for tag "Android" (as I created menu item) and url for such tag is "/en/mytags.html" (the same url as for menu item). May be it can help to solve issue?

Also I created menu item for the list of tag (joomla component tags) and when I filtering by joomla item tag I got such url "/en/menu-item-url/13-blog.html". As you may see url contains id for the tag. Why K2 doesn't contain ID for K2 tags?

How to create menu item for the list of all K2 tags? I think it will solve the issue.
Using menu I can create menu item only for one K2 tag.

I just found that K2 search module also doesn't work. When I try to search it send me to 404 page with url "/en/search.html?searchword=money" (search word was "money", I turned on Advanced K2 SEF settings)