It's even more mysterious because unlike the post-1997 versions, the burn-free JSC/pre-'93 P&S/ITV corridor shot DOES have the optically-enhanced shaking. This means that the marks were NOT introduced when the fake camera shake optical was made.

I can envision two possible scenarios: Either there was a lab mishap on the negative some time after the JSC source was struck from the negative, or perhaps the IP was assembled after the opticals were done but BEFORE all of them were converted to IN and cut into the negative?

I thought many/most of the opticals were done on CRI so that they could skip a generation of degradation? So could the version in JSC have even been some kind of test positive before the final CRI version was conformed into the negative? Maybe this was in the last round of shots to be spliced into the neg, and the marks were introduced during the CRI process?

Was this some kind of test assembly with every finished shot, that was signed off on and the negative subsequently conformed to match with the "cleaner" cementing that we see on the 35mm bootlegs, Technidisc, GOUT, etc.? (Does Moth3r's bootleg show the same glue marks that DO appear in the Technidisc?)

Maybe they kept this version as some kind of backup? I notice that this version has only appeared in non-release-print contexts - home video releases, 4:3 16mm prints like the version broadcast on ITV, and curiously enough, the 1982 reissue trailer...

We will likely never know the answer to this one...