Connect three chests. Add a retrieval module to chest A. Set type to e.g. an ingot.
Add ingots to chest B and C.
Works.

Now add a tag or nbt filter to chest A pipe.
Pipe only retrieves items from one chest.

Using MC 1.16.5 on java 17.0.1 64 bit

Thank you for this mod.

As you can see, I cannot reproduce this issue with the setup you provided. Please try to reproduce it without any other mods installed.

I don't have the time to do full mod elimination cause of the sheer amount of mods, it's a modpack (Enigmatica 6 E6 - 1.16.5),

However:
I've retested with your setup and it works but I managed to break it by adding and removing the second part to the receiving chest (making it a double chest).

once it's stuck with a double receiving chest, changing the filter won't unstuck it, seems like it loses mapping to the second chest.

https://www.youtube.com/watch?v=pghg4sW-sEQ
what a shitshow getting an mp4 resized and uploaded jeez

Thank you for your reply.

Double chests behave weirdly in 1.16, sadly. You should be able to fix your setup by breaking and replacing the chest that used to be a double chest, but other than that, there's nothing I can do since the 1.16 version isn't supported anymore.

This issue should be gone in the 1.18 version, though, since the way chests are handled by Minecraft/Forge is a lot more consistent now.