See https://discourse.phabricator-community.org/t/bulk-move-tasks-to-project-not-working/3000.
- The column selection for "Move to Project..." is incorrect, and shows the current board's columns rather than the target board's columns.
- Proxy columns (subprojects and milestones) are available for selection, but should not be. Their behavior is complicated/misleading.
- Hidden columns are available, but not cued.