Bedrock 26.51 – Resource pack failed to load, chunks not rendering and severe lag

After updating Minecraft Bedrock to version 26.51, I started experiencing severe performance and rendering problems that did not occur before the update.

The problems happen even in completely new worlds and with only 5 render distance chunks.

I repeatedly get this message:

"At least one of your resource or behaviour packs failed to load."

I have no custom resource packs or behaviour packs enabled. Only the default Minecraft texture pack is present.

I also experience:

• Severe lag/stuttering even at 5 chunks.

• Chunks sometimes fail to render correctly.

• Large holes/areas where terrain is missing or appears black/white.

• The problem occurs in newly created worlds.

• The problem started immediately after updating to 26.51.

• Before the update, Minecraft Bedrock worked normally on the same PC.

Steps to reproduce:

1. Update Minecraft Bedrock to 26.51.

2. Create a new world.

3. Set render distance to 5 chunks.

4. Do not enable any custom resource or behaviour packs.

5. Enter the world.

6. Observe the resource/behaviour pack error and chunk rendering/performance problems.

Expected result:

The default Minecraft resource pack should load normally and newly generated chunks should render correctly without severe stuttering.

Actual result:

The game reports that a resource or behaviour pack failed to load, chunks fail to render correctly, and the game experiences severe stuttering even at very low render distance.