As the title says, I have this problem. The option to disable scrolling simply applies
html.lb-disable-scrolling{overflow:hidden;position:fixed;height:100vh;width:100vw;}
To the html. Upon changing to set it to body instead of html and removing position it works as intended. (had to change target in js also from html to body)
body.lb-disable-scrolling{overflow:hidden;height:100vh;width:100vw}
But I wonder if there is a better solution?
EDIT: It seems that his solution also does not work on phone device.