Regardless of the cause, the fix involves going to the system “App info” page for the Google Play Store and opening “Storage & cache.” Tap “Clear storage” and then “OK” to confirm you want to delete app data. It presumably occurred following silent Play Store updates. Rather, they just see a way to open “App info.” I’ve personally had this happen twice on a Pixel 5 running Android 11, and it was unclear both times what caused it to disappear. Over the past few weeks or so, some users have found that long-pressing Google Play no longer shows the My apps shortcut. This shortcut is more convenient than ever since the Play Store redesign where you have to tap the top-right corner instead of just swiping on the left edge. This directly opens the “My apps & games” screen to the “Updates” tab where you can quickly install new versions.
Long-pressing on the Play Store icon from your homescreen reveals a “My apps” shortcut. If the shortcut has recently gone missing on your Pixel, there is fortunately a fix for that problem. App shortcuts have been a part of Android for the past several years, and the most useful one from Google is arguably for the Play Store “My apps” page.