Hi Isomorphic,

please see this sample (SNAPSHOT_v11.1d_2017-03-13/AllModules Development Only) and try to select and deselect entries fast in the 2nd and 3rd SelectItem.
For me, if I click fast to select and deselect (not a doubleclick, but still fast), the entry is shown as deselected in the list (no check on the left), but still as selected in the Item itself.
See this video:

Click image for larger version

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Best regards
Blama