The tap does produce the modded sap, but for some reason it is limited to 20 at a time. If I let the tap generate sap it’ll stop at 20, but then if i access the tap inventory then exit (without removing the sap that is in there) it will add another 20 on top of the sap already in there.
This has only became a problem since one of the last few ark updates that changed something.
I do know it’s to do with the tap as someone has already overcome the problem an got it functioning how it used to/should with a recent update of their mod.
I put their tap in the tree come back few hours later and the tap is full (5 slots) of modded sap.