Minecraft Bedrock Edition 1.21 introduced significant changes to the game’s engine, specifically regarding how the player entity is rendered and how animations are handled in code.

Most addons rely on "player.json" files to override vanilla behaviors. When Mojang updates the game, they change the structure of that file. If the addon tries to force an old structure onto the new game, the game says "Nope," and either crashes or disables the mod.

The version you are seeing labeled "fix 90" usually refers to a patched version of the addon optimized for the newer rendering engines (often related to specific render dragon fixes or version build numbers in the modding community).

Once you have the file:

Experimental Toggle: Action Stuff usually requires "Experimental Gameplay" / "Beta APIs" to be turned on in the world settings. Make sure this is active, or the animations won't trigger.

Minecraft Bedrock Edition offers players a vast marketplace of skins, maps, and add-ons, but many enthusiasts prefer third-party content such as “Action Stuff” — a popular add-on that enhances animations, combat mechanics, and visual effects. However, downloading and installing such content for version 1.21 often leads to a frustrating problem: the game freezes at 90% during import or world loading. This essay outlines the cause of this issue and provides a step-by-step fix.

Before you click any random link promising a download, a word of caution: Beware of scams. Many sites claiming to have "Action Stuff Fix 121" are actually clickbait or ad-farms.

Here is the safe route to getting your movement back:

To get Actions & Stuff working on Minecraft Bedrock 1.21.90 , you should primarily use the official Minecraft Marketplace to ensure compatibility and avoid potential malware from third-party sites. Recent updates to Bedrock, like version 1.21.90 (the "Chase the Skies" drop), introduced significant graphical changes such as Vibrant Visuals, which can sometimes cause texture glitches with high-resolution packs. How to Download and Fix Version 1.21.90

If you are experiencing issues where the animations or textures do not appear correctly after the 1.21.90 update, follow these steps to apply the common "16x resolution fix":

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If you want guaranteed working "action stuff" for 1.21 right now:

Go to MCPEDL → Search "Action & Adventure 1.21" → Sort by "Last Updated" → Pick the top result from a creator like Razzleberries, Fusion, or Vatonage.

Would you like a direct list of verified 1.21 action add-ons with download links? (I can provide names so you can search them safely on MCPEDL.)

It looks like you're looking for a download of an "Action Stuff" add-on (likely a PvP/animation or FPS-style action pack) for Minecraft Bedrock 1.21, with a fix for a known issue (possibly the "90 FOV" or "90% animation" bug).

Here's the straight answer:

If you are downloading from a third-party link sent by a friend or found in a Discord server, ensure the file name ends in .mcpack or .mcaddon.