Is there a reason no storage mods which add craftable storage based on vanilla blocks have been updated for A21?

[FramFramson]

I was looking for a mod which I was used to thinking of as ubiquitous: a storage mod which makes some non-container vanilla blocks into craftable storage containers, plastic water barrels, for example.

 

As far as I can tell from both modding sites, not one mod with any such blocks in it was updated for A21. Is there a reason why? The only updated mods are ones which add crafting recipes (and permanence, in the case of destructible loot containers like food piles) for blocks which already exist as containers in the game. Did something happen in A21 which broke those mods or prevented blocks from being containerized? Can this be easily fixed in the modlet .xml files or re-modded in?