So this is not the Community Edition (GCE) which this category is about but the Source Edition (GSE). Moving to the correct category accordingly.
Please also note that GSA 8.0 (beta2) is a quite outdated release. Try to update to the latest stable releases listed in GVM-10 (end-of-life, initial release 2019-04-05) - Greenbone Community Edition - Greenbone Community Forum and check if your issue is solved there.