Update: the 1 BAT that I sent over from MetaMask yesterday to “test” the wallet has now appeared in my rewards wallet this morning. However, the one-time tips still have not yet shown up. I did have auto-contribute turned off, but I will turn it back on and see if it changes at all.
Just wanted to give you an update: after making sure Auto-Contribute was turned on in the Rewards Settings, and “Include in Auto-Contribute” was turned on, the tips did go through and register in my wallet history in the Rewards Settings. So just hoping that we will be able to send one-time tips through in the future without having to enable Auto-Contribute for it to work. Thanks for the support!