1.15.1 Pre-release 1 has fixed this issue for villagers. Foxes still remain an issue.
This is still an issue in 1.15.
This bug also seems to cause a side effect.
The log file can get pretty large in size (In my case over 800 MB.) If you stay next to a spawner (With a villager or fox inside) for some time.
This is because the same error keeps getting printed over again in the log file until you unload or remove the spawner. (Changing the content of the spawner also works.)
This only seems to effect client side, and not server side.
Still an issue in 1.14.3.
Can I request ownership of the ticket?
Still an issue in 1.14.3 Pre-Release 4.
Still an issue in 1.14.3 Pre-Release 3.
Still an issue in 1.14.3 Pre-Release 2.
This is still an issue in 1.14.2
Confirmed for 1.14.2 Pre-Release 3.
Foxes generate a different error in the log file. I have updated the report to the other error.