game: 1.21.1
mod: 2.0.2
neoforge: 21.1.72

It just can't either receive or send source from/to ars like it did in 1.20

Works fine in dev. Do you have a setup that can be reproduced? Does the network containing the ME Source Jar include any source storage cells at all on any chests/drives?

I am having an issue where sourcelinks will not deposit into ME Source Jar, nor imbuement chamber pulling from one.

Source jar and system are powered by system, they are online and there is a source cell in the drive to the right

I'm having the same issue in ATM9 to the sky modpack (1.20.1)

I have a source cell in my system but the source only gets sucks out of the jar and then its gone. (Both the normal jar and the me one)