Creakings summoned via spawn eggs disappear when entering end portals

The Bug:

Creakings summoned via spawn eggs disappear when entering end portals.

Steps to Reproduce:

1. Construct an end portal and summon a creaking nearby.
2. Fly above the end portal and teleport the creaking to your location by using the command provided below.

   /tp @n[type=minecraft:creaking] @s

3. Enter the end portal and look for the creaking.

Observed Behavior:

Creakings summoned via spawn eggs disappear when entering end portals.

Expected Behavior:

Creakings summoned via spawn eggs would not disappear when entering end portals.