iOS 15 Bug with Widgets Going Blank

After updating to iOS 15, I've been experiencing the following issue:

Every time I enter the widget library from the jiggly mode, I check out widgets for two random apps, and when I open the third app, I suddenly only get blank squares/rectangles there.

If I leave the widget library at that point, there's a fair chance that my home screen widgets remain functional. If I continue browsing the widgets though, I'll only get more blank widgets instead, and then all of my home screen widgets will go blank one by one, as well.

The only way out of this is the phone's restart.

I've made a screen recording demoing this issue:

https://youtu.be/nEsqtEJ0bJE

Here's a Reddit thread discussing the same issue:

https://www.reddit.com/r/ios/comments/pt4n2d/ios_15_bug_widgets_appearing_blank/

As mentioned there, I sort of suspect one of the 3rd-party apps might be causing it; but for me, it's impossible to identify it. I can reproduce this issue every time with a completely random selection of apps in the widget library, and it always results in the same behaviour.

Any possible tips are welcome. Cheers!