Shulker doesn't reopen after teleportation

If a shulker gets shot (ex:with an arrow) they won't reopen after teleportation

Steps to reproduce:

1. Go to an end city
2. Find a shulker
3. Shoot it without killing it (making it teleport) 

Expected results: shulker will continue to function as normal

Observed results: shulker will keep shooting but without opening

Video of evidence: https://drive.google.com/file/d/1t7_ocdEdX5xXdXlCDgBY55Uvc4luD5de/view?usp=drivesdk