### **Environment**:

Your OpenProject Version: 12.0.6

### **Steps to reproduce:**

1. Have `direct_upload` of attachmens set to Begin of the insertion`false`End of the insertion Begin of the deletion `false` End of the deletion
2. Have a custom field configured for a work package. The effect is visible best on multi select user custom fields but every custom field is affected.
3. Have a work package with the custom field. It does not matter whether a value is set or not but the bug is more visible if it is set. Begin of the insertion

End of the insertion Begin of the deletion
4.


End of the deletion <figure class="image op-uc-figure"><div class="op-uc-figure--content"><img class="op-uc-image" src="/api/v3/attachments/27064/content"></div></figure>

1. Upload an attachment to the work package.
2. Reload the page

### **Actual Behavior**

<figure class="image op-uc-figure"><div class="op-uc-figure--content"><img class="op-uc-image" src="/api/v3/attachments/27066/content"></div></figure>

The custom field is not rendered and appears to be empty.

In case a multi select user custom field is configured, an error is reported in the console:

<figure class="image op-uc-figure"><div class="op-uc-figure--content"><img class="op-uc-image" src="/api/v3/attachments/27067/content"></div></figure>

### **Expected Behavior**

Custom fields rendered.