A texture loading issue introduced in 1.33 that causes models like Spawning Grounds and Tidal Guardian to display incorrectly is still present in this PTR. According to a member of the former classic team, there is a Jira ticket detailing how to fix this.
This is accurate. Here is the last post:
still present in 22.214.171.12408
Will Blizzard ever get things right with WC3R?