I cannot loot the 2nd part of Trial of the Sea Lion quest for the druid water form. I could pick the one on the coast in silverpine forest, but the one in Moonglade is unclickable, I can see the “artwork” of the quest item, just unclickable…
If I remember correctly the chest that holds the item can spawn in two different locations. Maybe the spot your using isn’t actually spawned?
Isn’t the one in moonglade the first part of the aquatic form? Afterwards it sends you to Darkshore & Westfall for Alliance, or Silverpine Forest & Barrens for Horde.
BTW, this bug report forum is for BFA. Classic has its own bug forums
https://us.forums.blizzard.com/en/wow/c/wow-classic/support-and-bug-report