{ data: [], palette: [], "#c": "appmek:chemical", amount: 288L, gasName: "mekanism:hydrogen", t: 0b }
{ data: [], palette: [], "#c": "appmek:chemical", amount: 86L, gasName: "mekanism:hydrogen", t: 0b }: "86"
you should remove the amount key in AEKEY

Probably not, but I'd also drop the "amount" from the Mekanism stack serializer (or force it to 1?)

Are there any actual problems?

it sometimes will cause some bug in storage cell

some bug

You'll have to be more specific.

It is best to set the "amount" to a fixed value of 1 or delete it directly.

When directly using NBT storage, it can lead to certain errors, such as having multiple keys, etc.