And your 'Lightroom' is Version Number? (Classic or Mobile?)
Lightroom (mobile/desktop) does have an option to Export. [Ctrl+Shift+e]
But TBMK there is no Export option that will open Ps after the export.
Lightroom can 'Edit in Photoshop' [Ctrl+e] Are you using this shortcut?
Lightroom-Classic can Export a file and open it in Photoshop if you have Ps specified in the {Post Processing} section:

This {After Export:} field should show "Do Nothing" unless you specifically want something to happen- after the Export.
Regards. My System: Windows-11, Lightroom-Classic 15.4.1, Photoshop 27.8, ACR 18.4, Lightroom 9.4, Lr-iOS 10.4.0, Bridge 16.0.3 .