Tooltip information is not showing when using pfUI, at first i thought this was a bug in pfUI, but when testing a older version of Questie (3.69), the bug was not present.
Related issue and more explanation of how to reproduce the bug at pfUI issue https://gitlab.com/shagu/pfUI/issues/775

Tooltips are working fine with just Questie and EQL3, so this is likely a problem on the pfUI side. If the issue on their repository gets closed stating the problem is in our code feel free to re-open this issue.