Fetch failed 403 Forbidden in Admin

since last update:
Img1
server logs:
ModSecurity: Access denied with code 403 (phase 2). Match of "rx ((?:submit(?:\\+| )?(request)?(?:\\+| )?>+|<<(?:\\+| )remove|(?:sign ?in|log ?(?:in|out)|next|modifier|envoyer|add|continue|weiter|account|results| select)?(?:\\+| )?>+)$|^< ?\\??(?: |\\+)?xml|^<samlp|^>> ?$)" against "ARGS:notifications" required. [file "/etc/apache2/modsecurity.d/rules/tortix/modsec/50_plesk_basic_asl_rul es.conf"] [line "308"] [id "350147"] [rev "143"] [msg "Protected by Atomicorp.com Basic Non-Realtime WAF Rules: Potentially Untrusted Web Content Detected"] [data ""] [severity "CRITICAL"] [hostname "guitar.axelrank.de"] [uri "/admin/notifications.json/task:processNotifications"] [unique_id "WJLlIH8AAQEAADxZ1uwAAAAO"]

Let's keep this on GitHub, easier to follow, thanks! https://github.com/getgrav/grav-plugin-admin/issues/951#issuecomment-276802892

I could solve this by setting the web application firewall (ModSecurity) rule id 350147 to ignore.
Question remains: ...Potentially Untrusted Web Content Detected ?&quest;?

still cannot post on github.