I would suggest that herkie posts about said bugs in his topics. I'm pretty sure people more up to date with FSO developement could spare him a ton of bug hunting.
Oh, I already know what the bug is. It's the ships that I flagged "Don't move" (ship miscellaneous option). With FSO 3.7.4, the ships flagged as "Don't move," will stay in place but they can still rotate to face their target (like the Mjolnir). Now, with FSO 22, they absolutely don't move at all. That's understandable, I guess. I used the "don't move" feature in 1 AFR mission and 2 TBG missions as a "Mjolnir-type" remote artillery strike gameplay.
And I solved them already. It's just a matter of adding ship assets with the same model and table data but with zero value in their foward or backward movements like the Mjolnir. So, I won't have to use the "don't move" flag anymore and, instead,
use those new assets. I have already done the fix and it will be in an upcoming update.
With the Archangel dreadnaught bug in the mission "Lightning From Heaven," I mistakenly gave an SEXP order to the ship before it stopped decelerating from subspace, 10 seconds after it energed ("has arrive" SEXP). Players will notice its speed to be 300ms even if it had stopped moving. I already fixed this too along with the bug of the dreadnaught not firing.