| Reproduction steps | Expected behavior | Actual behavior |
| 1. As a logged in user, have an unread message on two different another wikis | The Your messages icon shows "2" | as expected |
| 2. Click the Your messages icon | The message list opens, showing collapsed "More messages from another wiki" | as expected |
| 3. Click "View 2 messages" | The list of messages from another wiki expands | as expected |
| 4. Click the first message from another wiki | The corresponding talk page opens | as expected |
| 5. Click Back in your browser | The previous page is displayed, the list of 2 messages from another wikis is still displayed and expanded | as expected |
| 6. Click outside of the list of messages | The message list disappears | as expected |
| 7. Click the Your messages icon | The number of messages updates to 1, the message list opens, showing collapsed "More messages from another wiki" | as expected |
| 8. Click "View 1 message" | The list of messages from another wiki expands | The list of messages from another wiki expands and collapses immediately [BUG] |
MediaWiki: 1.28.0-wmf.4 (rMW9cbb25d99e98) (tested at srwiki)
Client: Firefox 46.0.1 with Adblock Plus, WinXP
