You've probably seen this, but if not is it relevant?
https://community.adobe.com/t5/premiere-pro/vertical-red-line-on-video/td-p/10681560
Delete the dip to black as this is a double side transition and not suited to be used as a single side one. Use cross dissolve or better yet keyframe opacity.
Could be this. I'll try this! Thanks for your effort CYOA.
@Squaredisk started
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You've probably seen this, but if not is it relevant?
https://community.adobe.com/t5/premiere-pro/vertical-red-line-on-video/td-p/10681560