I'm facing an issue of displaying the right side bar in spfx web part on the site page in communication site. When i load the side bar in online/local workbench, it is working fine(coming from top of the page). But in site collection, it is starting from the web part area, but not from the top of the page, even though i provide higher z-index for that div. Any solutions for this ?
Note: this was working months back (last checked on august 2018)