Why does the ANC mode switch automatically when only wearing the left earbud of the Redmi Buds 6?

The issue is described as below:
When wearing only the left earbud, manually switch ANC to the mild noise cancellation mode in the settings. After that, wear both earbuds, then remove the right earbud. The ANC mode will automatically switch to deep noise cancellation, even though it was set to mild.
The reason analysis is as follows:
When frequently switching between single earbud (left or right) and changing ANC modes, there is a small chance of experiencing mismatches.
The solution to this issue is as follows:
This issue has been optimized in the latest firmware update. To solve this issue, please update the earbuds to the version 1.1.2.6 or above in the Xiaomi Earbuds APP to have a better experience.