Basically if you upload a world to Realms with more files than your mac's max open file limit, rather than stopping you before it uploads, a lot of bad things happen. As expected the world won't upload with the error, "Too many unenclosed archives" or something along the lines of that. More importantly though this will cause other running apps to crash or stop responding at all until a full restart is done, including Safari/Google Chrome/Firefox/Slack/Discord.
Tl;DR: If # files in world > max open files (default is 12.8k or so), Mac OS fails and causes a LOT of different problems on your machine.
Thank you for your report!
Minecraft Realms for Java Edition has received a lot of updates and fixes over the last two years, so this issue has probably already been fixed in the meantime (e.g. because it was a temporary outage or an issue with the base game).
Since this bug report has not been updated since at least two years, please let us know if this is still an issue in current versions of Minecraft and update the bug report if applicable. If this is no longer an issue, please let us know as well. Thanks!
This issue is being temporarily resolved as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.
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