Tilesheets not updating

Occasionally when I update the png for a tilesheet, the Tiled version does not update properly with the new assets. Usually save/quit/restarting fixes this, but sometimes it does not. There does not seem to be a pattern to reproduce the issue, unfortunately. However, a map I am working on right now is having the issue, I can provide a copy if needed.

Start with the affected map, if available, and reproduce the report by updating a tilesheet PNG, then saving, quitting, and restarting Tiled. Done means identifying a reliable reproduction pattern and ensuring the tilesheet assets update correctly without requiring repeated restarts; no source file or test is named in the report.

Written by the indexing model from the issue text.