After recent changes in https://secure.phabricator.com/T8302 it's not possible to ctrl-click anymore to open lookup for symbol.
Always reproducible. To reproduce, open for example
https://secure.phabricator.com/diffusion/P/browse/master/src/applications/system/engine/PhabricatorDestructionEngine.php
Move mouse to any symbol and press control after that. Attempt to click on symbol. It doesn't work. If you mouse out and in symbol element it starts to work.