Thumbnails never cached and stop appearing

Description

In a fresh VLC installation where Let VLC scan my device for media content has been unticked, thumbnails are shown erratically.

All settings (except for the scanning functionality) are left as default.

In the Browse view, when a directory is first entered, thumbnails are generated as expected. However, after leaving and re-entering the directory, thumbnails are no longer visible, and often won't be re-generated again in a long while.

Context

App version

This is a long standing issue. VLC-Android-3.5.0-RC-2-armv8-20220710-0118.apk (current latest) shows the problem.

Android version

Android 12

Device model

moto g100