"Paste Value" is always greyed out in a port's context menu when using "Copy Value" in a Graph Toolkit graph

Steps to reproduce:

1. Open the attached "PasteValueRepro" project
2. Open Window > QA > Paste Value Repro
3. Press "1. Set up repro" button
4. In the graph window, right-click SOURCE's "Value" row (the label, the number field and the connector all open the same menu)
5. Select "Copy Value"
6. Right-click TARGET's "Value" row (the one showing 22)
7. Observe the "Paste Value" menu item

Actual results: "Paste Value" is greyed out, so the copied port value cannot be pasted

Expected results: "Paste Value" is enabled, and selecting it sets TARGET's "Value" to 11

Reproducible with versions: 6000.6.0b1, 6000.6.1f1, 6000.7.0a6

Not reproducible with versions: 6000.5.11f1, 6000.6.0a7

Can’t test with versions: 6000.0.0f1, 6000.0.83f1, 6000.3.24f1 (due to feature not available/compilation errors)

Tested on (OS): MacOS Silicon Tahoe 26.6.2, Ubuntu 24.04

Notes:

• Also reproduces with Block nodes (cannot be pasted)