BIAB 2021, Build 809, Run as Admin.

Today I started to do some edits to a backing track file.
I loaded up the original .sgu made in BIAB2018 or 19, made the changes then noticed a strange knocking sound at the end of the guitar track.

The song ending is basically a similar layout for all my Backing tracks.
Bars 67-70 slow down by 1 or 2 BPM each until the hold at Bar 71.
The played Beat 4 at Bar 74 is a work-around I have found is the only way to have a tambourine Sizzle at the final hold Bar 71.
The End Bar 75 is a Stop to kill the 2 bar ending.
This process has been working with no issues for several years until BIAB2021.

When I Drag and Drop the guitar track into RB the artifacts Number 1 are clearly visible as well as audible, sounds like knocking or thumping.

I Dragged the RTs from BIAB32 and 64 to see if both had the same issue.
Settings in each were the same but the guitar from 32bit is slightly louder, but no noticeable difference with the tambourine.

Artifacts Number 2 on the Tambourine, these are audible clicks at the end of a Sizzle. The Tambourine Sizzle works, complete with click, for holds mid song, but I have to apply the above work-around for the last bar.

The issue with Tambourine clicks and holds is not new, I reported to support 2 or 3 years ago and was told it would be fixed in the next update.
The issue with guitar artifacts is new and I would prefer not to have to perform any more work-arounds or Clean-ups

Vintage

Attached Files (Click to download or enlarge) (Only available when you are logged in)
Song Ending.jpg (102.26 KB, 120 downloads)
DragnDrop.jpg (199.87 KB, 120 downloads)