Can you try the following please:
Toggle "Reduce Transparency": Go to Settings > Accessibility > Display & Text Size and check "Reduce Transparency". If it is ON, turn it OFF, as this feature has been known to cause UI glitches and crashes with the new "Liquid Glass" design in iOS 26. If it's OFF, leave it OFF and ignore the rest, as that wont be the issue.
Then launch the app, and see if that works, please.