I have tracked the issue here: https://secure.phabricator.com/w/changelog/2019.16/
and more specifically here:
ProfileMenu: The ProfileMenu API has changed. If you have custom ProfileMenu item implementations, they will likely require minor updates. D20358 represents the bulk of the API changes: newNavigationMenuItems() has become newMenuItemViewList(), and newItem() is now newItemView(). These API changes support tracking the selection and highlight state of items in cases when a single ProfileMenu item produces multiple distinct controls in the menu. Today, there are no such upstream cases, but this made some of the other changes easier. See also D20357 for more discussion and rationale.

https://secure.phabricator.com/D20358

@Aklapper Also suffering from the problem here. Is there any workaround or maybe some patch to test?

@Shed4: The workaround would be someone to take a look at the previous comment and fix the code. As https://phabricator.wikimedia.org/tag/phabricator-sprint-extension/ says, this project is unmaintained. Your contributed patch is welcome.

Just got a head-up from Alves Logo Michael (kairel) with a fix that I merged in my fork https://github.com/vlaza/phabricator-extensions-Sprint

Check out his commit about the fix.

https://github.com/kairel/phabricator-extensions-Sprint/commit/0d77d94a351ad2e38d8f097bf8f2146ff6369797