Sling Starter 12: Unable to launch Composum

environment:

• Windows 10
• java 11.0.13 2021-10-19 LTS
• Sling Starter: https://github.com/apache/sling-org-apache-sling-starter

started sling starter 12 (or actually 13-SNAPSHOT from current master branch) with:

mvn clean install
java -jar target/dependency/org.apache.sling.feature.launcher.jar -f target/slingfeature-tmp/feature-oak_tar.json

when trying to access composum via http://localhost:8080/bin/browser.html i get the normal sling login (if not logged in already) and login as admin/admin.
directly after this i see a blink of composum, which is replaced immediately with another composum login dialog:
image-2022-03-01-17-47-08-965.png

error.log from the instance