Why are there so many missing chunks?

uNmINeD can only show chunks that are already saved in the game. Bedrock Edition saves much less chunks while playing than Java. World pregenerator tools and mods can be used to force Minecraft to save chunks and fill the missing areas.

Suggested world pregenerators:

Is it safe to use uNmINeD while Minecraft is running?

uNmINeD itself cannot screw up or modify world files, but Minecraft may not like other applications opening files it is currently using, which in theory could lead to data loss within the running Minecraft instance and can cause corrupted world files. We do not have access to Minecraft’s code to verify this, so the short answer is that we don’t know for sure.

It is always a good idea to completely close Minecraft before using uNmINeD or any other external tools, and to back up your worlds regularly to avoid data loss.

Java Edition: According to experience so far it is most likely safe to open a Java Edition world in uNmINeD while playing the same world in Minecraft, as no one has ever reported an issue in the 10+ year history of uNmINeD, but it is generally not recommended.

Bedrock Edition: We do not have enough experience with Bedrock yet to be sure. There are users running uNmINeD on a live Bedrock server periodically, and using uNmINeD while playing a local game without any issues. In January 2023, a user reported a world corruption that occurred when using Minecraft and uNmINeD at the same time, but it is not certain that this caused the corruption. If you want to be sure about safety, always close Minecraft completely before opening a Bedrock world in uNmINeD.

Is uNmINeD a malware/virus?

No. Some cautious antivirus tools may consider it “dangerous” because it is a less common software that relatively few people download, and it is not signed by a certificate because software signing certificates are expensive.

If your antivirus software says it is a malware, send them the downloaded package for analysis, so they can improve their software to have fever false positives.

Be careful not to download uNmINeD from anywhere other than this site (unmined.net). There are plenty of malicious sites that offer fake minecraft tools for download.