Code completion for 3rd party libs

[AZ]

Hello,
I'm pretty sure the code completion and documentation popups used to work some (long time ago), but now for libraries installed by platformio into ~/workdir/.pio/blah-blah/lib/blah_lib i can get either - neither code completion nor documentation popups work.
Any tips are very welcomed, please.

[AZ]

additional screenshots.
the warning I get when I try to get to either implementation or declaration of ESPUI. Needless to say, the code compiles without an issue.

[oBFusCATed]

Reporting a program for a enormous library doesn't help. If you want report this in a useful way you have to minimize the project to a self contained project.