A group with any Warp effect applied to it fails to render hidden objects within when these are shown back
When an image with 3 or more layers is grouped together then an arch effect is added to that group, the layer visibility toggle behaves strangely in a way where the layers disappear but do not reappear. once the layer visibility is back to on but the image cannot be seen Illustrator will allow you to click and drag the area to grab the "hidden" layer but it is now only an outline with no color fill until you move it. or refill the color. This is a feature we have used for years and never had an issue until recently (April 2025)

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Yep, can confirm now. Hiding a child group within another group wuth a Warp effect applied, won’t trigger re-rendering it back on canvas when shown back. The workaround it to try to move the top group to trigger its full re-rendering.
Thanks, Dan! -
Dan commented
Attached is an example of what we have been seeing. the video starts out showing the layers hide and reappear as expected but once grouped then the arch effect is added the layers no longer behave the same way.
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Dan, please share a test file and a video recording to show how it works (I mean how it doesn’t) at your side, please.
I try to reproduce it based on the description and it seems working fine. Perhaps I miss something or something else is in the play...