bug: ion-datetime-button: when clicking datetime-button a second time, date is not selected and previous month buttons does not work.

[shinkhouse]

Prerequisites

• I have read the Contributing Guidelines.
• I agree to follow the Code of Conduct.
• I have searched for existing issues that already report this problem, without success.

Ionic Framework Version

v8.x

Current Behavior

When clicking ion-datetime-button a second time, date is not selected and previous month buttons does not work.

Expected Behavior

When a value has been set the first time and we open ion-datetime-button again, the date should still be selected and the previous and next month buttons should work properly.

Steps to Reproduce

1. Go to https://ionicframework.com/docs/api/datetime-button#basic-usage and go to Basic usage.
2. Click on the date button and select a date and confirm or tap outside picker.
3. Click on date button a second time, date will no longer be selected and previous month < button will not work.

Code Reproduction URL

https://stackblitz.com/edit/8ba5snu3?file=index.html

Ionic Info

(This is from your own StackBlitz link, ionic info is not installed, but here is the package.json)
{
"name": "html-starter",
"private": true,
"type": "module",
"main": "index.ts",
"scripts": {
"dev": "vite",
"build": "vite build",
"start": "vite preview"
},
"dependencies": {
"@ionic/core": "8.8.7",
"ionicons": "8.0.13"
},
"devDependencies": {
"typescript": "~5.9.0",
"vite": "^8.0.0",
"vite-plugin-static-copy": "^4.0.0"
}
}

Additional Information

Screen.Recording.2026-05-19.at.11.20.57.AM.mov