The "group" option does not work

When selecting multiple PIs and trying to click on the "group" button, it adds a "group1" line, but it does not hide the original connections. See screenshot.
When closing and reopening, it's still displaying all the connections, but not the names of the PIs/RIs. Group1 remains visible, but not associated to any connection.

The grouping also does not work in nested functions between the interfaces at the edge of a function and the inner functions.