When attacking a wolf tamed/not, it will become angry and would start attacking you, but when you feed the wolf while its aggressive/angry hearts start floating meaning you have tamed the wolf once again and its not longer angry but it will keep attacking and chasing you down.
How to reproduce
Start by finding a wolf.
Then attack/hit the wolf, it will become angry and aggressive and will want to attack you.
Feed the wolf while its attacking you and you will notice hearts floating up meaning its happy now.
But it keeps attacking.
Observations: Wolf keeps on attacking even after feeding it.
Expectations: The wolf should either eat the piece of meat without revealing any hearts, or it should calm down.
These hearts are for breeding, not taming. You tame wolves with bones, not meat. Meat is for breeding.