Art Manager visual update bug

During practically every operation, the frontend does not visually update to reflect the following events; there is no immediate feedback:

• Stamp set creation

• Asset deletion

• Often, even after uploading, we hit a dead end and don't see the assets.

Pressing F5 resolves this issue in every case, allowing us to see the current state.

Temporarily resolving the bug does not require pressing Ctrl+F5 or clearing the cache/cookies. (This might be important information for further investigation.)