When breeding animals in Vanilla 1.17 (this includes on a server) there are no Heart Particles around the animals.
This occurs in a single player world as well as on a vanilla server
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duplicates 1
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weird, but that seems to be the issue. I had a fresh install and for some reason, this is the first time my video settings have been different from the previous instances.
This "Bug" can be closed.
Thanks!

Thank you for your report!
We're tracking this issue in MC-621, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Duplicate ofย MC-621. Set your "particles" settings to either "Decreased" or "All" in order to resolve this issue.