Baby Nautilus Persistence Fix
by NBSurprise
Baby Nautilus Persistence Fix is a server-side datapack that gives bred baby nautili the persistence flag so they do not despawn.
What it does
Baby nautili bred from tamed parents are born without the persistence flag, which lets them despawn. This datapack sets the flag on those babies, working around the bug tracked as MC-305040. It also works when breeding is triggered through invisible achievement triggers. Server owners install it on the server; the mod is released under the GNU General Public License v3.0 or later and is not open source. Builds target 1.21.11 only, across Fabric, Forge, NeoForge and Quilt, and a data pack build is also available.
Key features
Persistent baby nautili
Baby nautili bred from tamed parents are given persistence, so they stay in the world after loading.
Fix for MC-305040
The datapack targets the tracked bug where bred babies were born without persistence and could despawn.
Achievement trigger breeding
Breeding that runs through invisible achievement triggers is covered as well.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Questions
Does a player need the mod installed?
Which game version does the fix cover?
In the catalog
Baby Nautilus Persistence Fix is one of 11,058 Mobs mods on ModsFinder, and one of 5,189 Mobs mods for Fabric. 19,862 mods support Minecraft 1.21.11.
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What the author says
This datapack fixes issue MC-305040, where baby nautili are born without persistence, thus making them able to despawn. It works through an invisible achievement, which triggers when you successfully breed nautili.
Official listing
- Modrinth page
- modrinth.com/mod/baby-nautilus-persistence-fix
- Owner
- NBSurprise
- Published
- 2026-03-14
- Updated on Modrinth
- 2026-03-16
- Facts verified
- 2026-10-15