track charts: map button only sometimes jumping to map

Pan map to a position where a track is visible, tap track, in row "Chart" tap > button, screen https://docs.locusmap.app/lib/exe/fetch.php/manual:user_guide:tracks:tracks88.gif appears, values of tapped position are shown, tap much away somewhere in the diagram, tap map icon on top right. Now, as expected, map is shown and positioned to the place whose vlaues were shown in chart.

Open My library, click a track, in row "Chart" tap > button, tap somewhere in the diagram so values of one single point are shown, tap map icon on top right. Now, map is not shown but overview of track – where not even the elected point is highlighted in the preview-chart which https://docs.locusmap.app/lib/exe/fetch.php/manual:user_guide:tracks:tracks6.jpg shows