Bedrock Developer Beta

Bedrock Edition Dev is a developer beta version of Multiple Bedrock Versions accessible only by developers and marketplace content creators. It was discovered and leaked by multiple sources and was showcased by a YouTuber named Element X.

He also leaked the 1.18 Developer edition which included the unreleased fireflies and bundles. However, he received an email from Mojang associates asking him to take down his video and threatening legal action against him.

Mojang is infamous for falsely striking videos showcasing the developer editions, and even authorizing Marketplace Partners to falsely strike videos that just mention Minecraft Developer Edition

The existence of the versions were also spread by a user known as TantalusC. He had gotten many copyright claims by Mojang/Mojang enforcement. Ranging from "Pirated Marketplace Assets" to being claimed for a song Mojang didn't own

Differences from Public Beta Versions
This version has additional development features, for example: An F3 Screen, ability to enable on-screen touch screen controls to test them for mobile versions, Advanced developer settings for terrain generation and weather, and ability to slow down the time without needing an add-on. In the 1.18 version, unreleased features like the firefly and the bundle are present