Players can't move through 1.5 black gaps

[rahulc07]

Describe the bug
Players cannot move through 1.5 block gaps. Eg a 2x1 gab with a slab in the top or bottom.

To Reproduce
Make a geyser server using geyser bungee/spigot

Make a 2x1 doorway (without a door) place a slab in the doorway at the top.

Players on java can move through these gaps while sneaking, but bedrock players cannot

(I know that this is a bedrock thing but I really need a fix for it.)

Expected behavior
Players can move through the gap as though they were on java

Server Version
Paper 1.16.3 latest build. Bungeecord (NOT waterfall) 1.8-1.16 (was downloaded 10/26)

Geyser Version
Geyser 1.1.0 (git-master-dfba278). Floodgate is installed though account used for testing was a linked java account

Minecraft: Bedrock Edition Version
1.16.4.0

Additional Context

[RedSmarty]

Maybe, this can conflict with anticheat. Correct me if i am wrong.
But u can make a behaviour pack to decrease player size. I am not sure how behaviour packs will work, but i am just a noob. xD

[Hellohi3654]

It is possible to modify player hitboxes on the client end
Behavior packs can do this so I believe it is possible

[rahulc07]

Any idea of how I would do this. I need the player to be 2 blocks tall until they go through the gap while crouching. Maybe I can use the crouch button as the activator but I have no idea how to make bedrock behavior packs

[zimzaza4]

It should be possible to modify the collision box

[zimzaza4]

At least nukkit can change the size of the player's collision box through the plugins

[rtm516]

At least nukkit can change the size of the player's collision box through the plugins

Could you link one of these plugins?

[zimzaza4]

At least nukkit can change the size of the player's collision box through the plugins

Could you link one of these plugins?

I'm not very clear about that
But I found a mini game in the easecation server that changed the player's collision box

[zimzaza4]

At least nukkit can change the size of the player's collision box through the plugins

Could you link one of these plugins?

What I can provide at present:

[zimzaza4]

Normal players: