The latter is probably another addon, and if it's not then not much can be done about it. SUF doesn't call Hide on the arena pet frames, so it shouldn't be an issue.
As long as it doesn't happen on normal use and only after configuration, I'm not too concerned. I'm guessing it's some weird edge case, but if you see it popup again after configuring, just reload.
If you do notice it happening without having configured the position first, definitely let me know though.
Are you doing any sort of weird anchoring of the party frames? It's using the same system that most every other addon uses for party frames, so if there was a core issue with it, other people would likely see it.
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If you do notice it happening without having configured the position first, definitely let me know though.
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Also does it happen all of the time?
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I know what the issue is though now, I'll look into it shortly.
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