Coppper gollem go brrrrrrr

Hey, I was building in Minecraft Bedrock and when I was doin /fill command, i found this Allow block, it doesnt bring up any menu, does anyone know what it's/was supposed to be used for, does anyone else know?

A screenshot of what im working on

YUP, ITS HAPPEND IN OVERLOOK BAY

So you see this backpack? You know that you have to wear it on your back, right?

Well um, i may have...

*heavy trailer drop* ULTIMATE POWER!!

Mr.Carryfish LMAOOOOOOOOOOOO

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Big

Snooftale