Grafana 7, searching for new variables removing old selections


I have a list of 300 variables and turned on multi select.
When I need to display some data in my graph I can search for a variable and it shows a small list of the variables, it’s really delicious. then I can select a variable and will search for a new variable, but when I start searching for the new variable the selection disappears on the first variable I just had selected, so when I select variable number 2 there is only one variable selected. It worked fine in the last version 6, but it does not work in version 7