Tried, cannot reproduce it, I see 3.4.5 at the end of the update, it will likely fix itself shortly while nodes are replicated.
Note that, this is a pure code update, not a single file changed in any of the two main GSX packages, only to code outside of it (it's just a single .PYE file), but the manifest.json (which is read to show the version) is in the packages, which didn't change, so it would require a bit more time, because we need to perform two update cycles just to show the version, which in this case is just cosmetic.
That is to say, you probably *have* 3.4.5 already, regardless what the version says and, it will likely show 3.4.5 very shortly.