claim shovel gone/disappeared

this is not a vanilla feature, its a plugin

I have no idea what that means. I am on a multi server. I have claimed land, used the claim marker to extend my area. And now i don't have the claim shovel, so cannot claim more? Or see my claimed area

Thank you for your report!
However, this issue is Invalid.

Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.

• Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.

• Any plugin issues need to be addressed to the creator of the plugin or resource pack.

• If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run modified server software.

Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki

That's brilliant. Thank you for your help. Yes i will contact them.