The attached patch provides a quick workaround.
--- gnome-bluetooth-2.27.5.orig/wizard/wizard.ui
+++ gnome-bluetooth-2.27.5/wizard/wizard.ui
@@ -210,7 +210,7 @@
</packing>
</child>
<child>
- <object class="GtkLabel" id="label1">
+ <object class="GtkLabel" id="label10">
<property name="visible">True</property>
<property name="xalign">0</property>
<property name="label" translatable="yes"><b>Fixed Passkey</b></property>

