In Manage indexes section of the cache, after I click Clear indexes it shows data which is changed after page refresh, i.e. imagine I have 2 entries in index, it shows 2 entries and 6k size in bytes.

Then I click clear indexes, number of entries becomes 0, but the size in bytes is still 6k. If I refresh the page, the size in bytes becomes 70 or 69 bytes. I have checked from UI perspecitive, it works fine - it returns the stats which were returned by request and shows what it got from the server. Seems that the request on the server is processed asynchnronously. But the side effect is that on the console wrong data is shown.

The same happens in case of Rebuilding index.