This bug is present in Bedrock Edition as of v1.20.81 as well.
The Trail effect particles are the only ones affected. If there are Fade colours, the Trail particles start as the Fade colour. If there is a Twinkle effect, the Trail particles will always be twinkling.
@Steve Hsu This is the same case for Lit Furnaces, but cats can still prevent them from being opened, even though it looks like stuff is inserted into the front of the Furnace. So maybe the same case could be for the Barrels? Or the cats could only disable the Barrels if it's face-up, though it's not super important.
@ampolive
It makes sense that it would be that feature, though the zombies only ever seem to spawn in the one direction, while any spawning in other directions have spawned off the mushroom island and pathfind towards me. Regardless, it seems unusual for this to occur on a mushroom island where mobs don't naturally spawn.
I put barrels in the list because they are similar to chests, since they are a container, and hold the same amount of items as normal chests, which may also apply to Shulker Boxes as well (though barrels are not the same as chests, not being tile entities, and Shulker Boxes are tile entities (I think) but behave differently from chests. Since they both can be placed and opened upside-down and sideways, I don't think the cat sitting on it should prevent opening them in all cases, but I may as well mention it.)
Can confirm in 1.21.4