Upstream has released updates that appear to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
23f557a0 SPIGOT-5380, SPIGOT-6958, PR-772: Add some missing entity API
CraftBukkit Changes:
fc3071161 SPIGOT-5380, SPIGOT-6958, PR-1085: Add some missing entity API
Note that the log4j-api version used in paper-api does not affect the version used in paper-server, this just affects the version people will see in their IDE when compiling against paper-api.