Regression bug in PT v1.3 on development.phenotips.org (1.3 snapshot) and on playground.phenotips.org (1.3 milestone 1R2). This bug is not present in PT v1.2.3.
Bug appears when searching for phenotype, selecting the info button and selecting "Browse related terms":
If you try selecting "Y" for any related term, that phenotype does not appear as a selected term on the right side of the "Clinical symptoms and physical findings" section of the PT form.
If you try selecting "N" for any related term, that phenotype appears correctly "NO <name of selected phenotype>"
This anomaly not present in PT 1.2.5.
I noticed a related behaviour associated with this bug. If you click back and forth between N and Y several times at least 3x, the term will finally appear in the phenotype selector. The combination depends on whether you select Y first or N first. Perhaps fixing the bug mentioned above will fix this behaviour as well.