Sorry that I post about it again, but since the original issue and all duplicates and related issues are "solved", I think I have to. Cause it is not solved actually. Please see original issue MC-144784, the latest comment (https://bugs.mojang.com/browse/MC-144784?focusedCommentId=533959&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-533959)
MC-147931
MC-144784 (disappearing entities) is still not fixed in 1.14-pre1
Resolved
Duplicate
0
No need to create a new report; commenting is sufficient.