Just started playing Destiny 2 again with the 18.8.2 drivers installed. No load time issues at all. As far as I'm concerned, this issue is resolved.
Further updates. A friend of mine was playing Destiny 2 with us on a 8350-FX RX480 based system and also took minutes to load into the raid. I asked if he had installed the updated AMD drivers (17.12.2), and he said he had the day prior.
Rolling back to 17.11.1 quickly fixed his issues as well.
Doesn't look like this issue has been resolved in 18.1.1, and isn't on the known issues list. Guess it is 17.11.1 for me for the foreseeable future.
Just another update. I ran the DDU and installed the 18.2.1 drivers and can confirm the issue still exists. Initially, the game runs great. But after moving between a few different planets, the load times gradually increase. Reverting to 17.11.1 once again completely resolves the issue.
Nope. Same issue. I tried doing a complete reinstall of Windows and loading just 18.2.2 without Relive. Same issue cropped up after I had jumped to a few worlds. My friends were all loaded into the Leviathan raid long before I got there. 17.11.1 once again corrected the issue.
In 18.2.3 release notes, Destiny 2 is cited as a know issue, but apparently is not the same as we have. I'll try the new driver this weekend.
Hmmm, it seems like the mid February Windows 10 update has resolved the issue. I just installed the update, and everything seems to be running fine with 18.2.3.