Thank you for your help, I managed to fix this issue - and probably prevented some upcoming issues - by adding the following to the ACL:
<acl>
<group name="ServerScript">
<acl name="ServerScript"></acl>
<object name="resource.*"></object>
</group>
<acl name="ServerScript">
<right name="function.loadstring" access="true"></right>
...
</acl>
</acl>
Have a great day, thanks again @IIYAMA for your help and time!