1.15.1 is a minor update to Java Edition released on December 17, 2019,^[1] which improves performance and fixes a few bugs in 1.15. This was the final version to be released in 2019 and 2010s decade overall.

Changes

Mobs

Dolphin

• Now can not spawn in bubble columns.

General

Performance

• Optimized chunk rendering performance, especially for chunks with many different block states.

Network handling

• Improved network handling of invalid biome IDs.

Fixes

10 issues fixed

From released versions before 1.15

• MC-96174 – Highlighted slot darkening.
• MC-126856 – When auto-jump is enabled, the game checks an incorrect block to decide whether the player should jump or not.
• MC-135050 – NullPointerException while tessellating block model.
• MC-150508 – Resource pack format was not incremented to 5.
• MC-152516 – Dolphins can spawn in soul sand bubble columns.
• MC-163571 – Walls are lit too dark when connecting to ice.

From 1.15

• MC-167482 – Corrupt chunk causes force upgrading a world to fail.
• MC-167530 – Anvils causing java.lang.StackOverflowError.

Other

• Fixed an error that was spammed to the game's log files caused by custom spawner blocks spawning villagers.
• Fixed a crash that occurred in the Realms screen.

Video

Video made by slicedlime:

Trivia

• 1.15.1 was the last full version to be released in 2019 and the 2010s decade.

References