xalign == 0.5 is removed on save

Hi, I get an issue about alingning, try to explain:

GtkCellRendererText inside GtkIconView when you set to 0.50 in Glade interface and save, the XALIGN property is removed from XML, not happends with a workarround put 0.51 what store to 0.5099999904632568

Glade 3.38.2 debian testing.