Seem to be receiving this error, utilising Carbon, but also had the same issue on Oxide

Unloaded plugin MonumentAddons v0.14.2 by WhiteThunder
Loaded plugin MonumentAddons v0.14.2 by WhiteThunder [624ms]
A hook request for 'OnSprayRemove[7f7462]' received:
- The current status is FAILURE: IL Compile Error
- Check for possible errors on the log file
Error while patching hook 'OnSprayRemove[7f7462]' (Method System.Void SprayCanSpray::Server_RequestWaterClear(RPCMessage msg) cannot be patched. Reason: Invalid IL code in (wrapper dynamic-method) SprayCanSpray:SprayCanSpray.Server_RequestWaterClear_Patch0 (SprayCanSpray,BaseEntity/RPCMessage): IL_0095: ret
)
at void HarmonyLib.Memory.DetourMethodAndPersist(MethodBase original, MethodBase replacement)
at MethodInfo HarmonyLib.PatchFunctions.UpdateWrapper(MethodBase original, PatchInfo patchInfo)
A general error occured while installing 'OnSprayRemove[7f7462]'
[Monument Addons] Loaded profile Default (5 entities).
Unloaded plugin MonumentAddons v0.14.2 by WhiteThunder
A hook request for 'OnSprayRemove[7f7462]' received:
- The current status is FAILURE: IL Compile Error
- Check for possible errors on the log file
Loaded plugin MonumentAddons v0.14.2 by WhiteThunder [459ms]
[Monument Addons] Loaded profile Default (5 entities).​

This is a Carbon issue. Nothing the plugin can do about it.

Oxide can't have this issue because it doesn't currently use runtime patching. Can you elaborate on what issue you saw with Oxide?

As for impact, this should not matter, unless you are placing sprays at monuments via the plugin.