I’m trying out xwiki, using the xwiki:stable-postgres-tomcat docker image. When I insert a children macro into a page (e.g. sandbox) nothing shows up and when I select the tree tab under page index I just see an empty page. Both work fine with xwiki 9.11.3 (xwiki:postgres-tomcat). Same flavor (standar) in both cases.
Try to clear the browser cache.
Thank you, that fixed it.