Minecraft wiki entry for Parity_issue_list, associated text: There is a new policy about accepting certain parity issues in the bug tracker; this was not in effect until late April 2020. A parity issue can be reported in the bug tracker if all of these following criteria are met:
it is present both in Bedrock and Java editions;
it behaves differently across editions;
it was introduced or explicitly changed in the Buzzy Bees update or later.
See this post by a moderator on the Mojira subreddit for more details.