Bug appears after installing update in android or iPhone, its because the update is not optimized properly
Not all smartphone brands focus on quality updates, because they only want to sell more and more smartphones.
However, in this way bugs are seen more in Android smartphones than iPhones, which slow down the smartphone.
Because the iPhone is made only by the Apple company, that's why Apple does a lot less in this way compared to Android smartphone makers.
But the Apple company also keeps on reducing the performance of the old model of the iPhone through updates
An Android smartphone user has got an Android 12 update even in his 3 year old device with bugs.