Infinity Cave adds a seemingly infinite cave system beneath the bedrock layer increasing the bedrock layer from -64 to -128. With this comes many new challenges and an overall different way of experiencing PvE.
Now, I know realistically that making the datapack work for Bedrock players isn't in the scope for your plans, or isn't even possible. However, on Minehut servers Bedrock and Java players can play together on the same server. I downloaded the 1.21.1 version and added it to the server, as a Java player I can enter it and play it as normal. My brother on the mobile version of Bedrock just falls through the Infinite Caves as if there's no blocks at all. I don't really expect there to be any fixes for such a hyper specific and small use case, but I thought I should report it just in case.
Now, I know realistically that making the datapack work for Bedrock players isn't in the scope for your plans, or isn't even possible. However, on Minehut servers Bedrock and Java players can play together on the same server. I downloaded the 1.21.1 version and added it to the server, as a Java player I can enter it and play it as normal. My brother on the mobile version of Bedrock just falls through the Infinite Caves as if there's no blocks at all. I don't really expect there to be any fixes for such a hyper specific and small use case, but I thought I should report it just in case.