If I had to hazard a guess is where the game goes into cutscene mode for those dialogue between Sendai and her minions and the scene is simply to the upper right of the current map - however resolutions have progressed a fair amount in the last few years and now the distance isn't great enough to be fully hidden any more.
As a cosmetic bug this is at best a "D" level bug. I've also never heard of anyone else reporting it. If you don't have a saved game for it and Gate doesn't see it on his playthrough we'll go ahead and move this to "not an issue" and see if someone else comes along and reports this also.
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If I had to hazard a guess is where the game goes into cutscene mode for those dialogue between Sendai and her minions and the scene is simply to the upper right of the current map - however resolutions have progressed a fair amount in the last few years and now the distance isn't great enough to be fully hidden any more.
But yeah, even if it is reproduced it is a minor graphical hiccup at best. Far more important things to get worked on.