Running OPNsense 21.1.1-amd64 (updated from initial install of 20.7.8), the edit doesn't appear to be working correctly in System -> Settings -> Tuneable - it brings up a _different_ setting than the one the edit button is clicked for.
Example:
The "target URL" for net.inet.icmp.drop_redirect shows /system_advanced_sysctl.php?act=edit&id=7, clicking the button brings up the setting for net.inet.icmp.log_redirect.
The edit button brings up the wrong "target" for every tuneable, but is "consistent" in doing so (i.e., net.inet.icmp.drop_redirect brings up net.inet.icmp.log_redirect every time). This happens in every browser I've tested with.
Same issue here
Perhaps if I spelled "tunables" correctly I would have seen this before posting:
https://forum.opnsense.org/index.php?topic=21451.msg100910#msg100910
Known bug, will be fixed in 21.1.2