Block Attribute Manager looses parametric/dynamic blocks

If parameters of parametric blocks are changed, their attributes can no longer be edited with the Block Attribute Manager.

For example, I inserted the parametric block "box" three times. In Block Attribute Manager it is displayed correctly at first:

Then I changed the parameter of the length of box 3. Now the Block Attribute Manager only shows two blocks. Changing the properties of the attributes, for example, the color to red, and click Sync, this change will not be applied on box 3.

I can't report this bug (if it is one) via support request because I don't have an active maintenance contract.

used BricsCAD: 25.2.07-2 German
System: Windows 11 Version 10.0.26100 Build 26100