Hi! SNMP was particularly broken and was fixed in the latest point release `8.0.1`. See the tracking ticket: Bug #7820: app-layer/snmp: internal error if app-layer is disabled - Suricata - Open Information Security Foundation
If you see this for any other protocol as well, please feel free to report.
We happily accept code contributions for any betterment but that should come via GitHub. GitHub - OISF/suricata: Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine developed by the OISF and the Suricata community.