All storage blocks seem to be missing a loot table which allows them to drop when broken.
Edit: Seems like they do have loot tables, but when trying to break them, they do not drop.
Edit2: From the looks of it, they just don't want to break in general, I'll upload a gif of it as soon as I can.
Edit3: They seem to crash the server when trying to break them with other methods than just hand/pick.

Crash from using a block breaker
Crash from left clicking with world edit wand
Tho from looking those crash logs, maybe I should report this to Refined storage? Since I don't see this mod appearing in the logs much...

Could you please provide a latest.log from placing and removing a storage block?

The problem is much bigger and could need a bit more time:
#23

https://paste.gg/p/wphant0m/c55134ec2eba4be6820288ba150669d8
I think that should have it, there are multiple since I caused multiple crashes and I'm not exactly sure which it is, but this seems to have related errors in it

I can't see the part where you place the block.
Does this happen with Refined Storage storage blocks, too?

Hmm... doesn't seem to happen anymore, so don't know if refined storage blocks do it too.
But they don't seem to drop when broken, your blocks, that is.

OH, it's only the fluids ones. and refined storage ones work fine.
https://paste.gg/p/wphant0m/01c722675f014ef48a5125628d84c71e
this log has me placing them, made sure to grab it after placing them down

item stack doesn't seem to actually decrease when placing them down

Oh yes, something is wrong with my fluid storage blocks. Thank you, I will try to fix it as soon as possible,

oh, there is still the issue of normal storage blocks not dropping when broken

1.4.2 is available soon

I can't reproduce this issue. For me, all the storage blocks drop the correct item This was an earlier state of the mod 🤦. Maybe it was because of the fluid storage blocks. Would be cool if you could test it and let me know. And if it still happens, a new latest.log would be very nice

https://gyazo.com/831ed809b5cbb83b0c0062ac237bf76b
I'll test it after getting the update

Oh, i see.. you don't have to try. I see. Will be fixed :D