Structure blocks when doing WE

When you're able, test this again with mods disabled to confirm whether or not this is caused by client mods.

Changed Status to Unconfirmed

Changed Status to Closed

This appears to have been the result of using client mods (maybe the WorldEdit client mod?), and is not reproducible on the server.

After further research, it turns out the issue was not a result of any client mods - instead, the issue was in fact not an issue at all. WorldEdit itself appears to have a server-side CUI feature included, available using //drawsel. In the case that anyone in the future runs into this issue, you can use the aforementioned command to enable/disable the CUI.