Deployable shield placement bug
The deployable shield has been extremely inconsistent with its placement since season 3 started. You used to be able to deploy it in many areas on many different surfaces. Nowadays, it's hard to tell where it can be placed because it is very consistent. You can try to go to areas that are extremely flat (like in the attached video) and it will still bug out. There was no mention of any deployable shield placement restrictions listed in any patch notes so it must be a bug.
It's pretty easy to replicate this bug: Just play support with deployable shield equipped and try to deploy the shield in many areas, even flat areas. You will get "BLOCKED TERRAIN" in many locations that you used to be able to in seasons 1 and 2.
Credits to Uniting for the photos and u/Barry_McCokkinher for the video in the attachments.
Hope to see this issue resolved soon as it is very frustration when you try to place a shield for cover and it bugs out, leaving you defenseless.