Steps to reproduce the issue: Disconnect while mounted on a nautilus and underwater.
Expected result: Disconnect and can reconnect later.
Actual result: During subsequent reconnections, get a “Connection Lost - Invalid player data”
Environment
Minecraft version: java - 25w41a
Operating system: Kubuntu 24.04
KDE Plasma Version: 5.27.12
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.13
Kernel Version: 6.14.0-33-generic (64-bit)
Graphics Platform: X11
Processors: 8 × 11th Gen Intel® Core™ i7-11390H @ 3.40GHz
Memory: 31.1 GiB of RAM
Graphics Processor: Mesa Intel® Iris® Xe Graphics
Manufacturer: Dell Inc.
Product Name: Vostro 15 5510
openjdk version "21.0.8" 2025-07-15
OpenJDK Runtime Environment (build 21.0.8+9-Ubuntu-0ubuntu124.04.1)
OpenJDK 64-Bit Server VM (build 21.0.8+9-Ubuntu-0ubuntu124.04.1, mixed mode, sharing)
Thank you for your report!
We're tracking this issue in MC-302672, so this ticket is being resolved and linked as a duplicate.
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