SpinBox Does not update rendered value when in Retainer box

TL;DR: When in RetainerBox, SpinBox does not change it’s rendered textual value.

UE 5.1.0, 5.1.1, 5.2

Replication is trivial:

  1. Create an User Widget with VerticalBox inside
  2. Put two SpinBoxes and wrap one of them in Retainer
  3. Setup the SpinBoxes with min/max values and enable slider
  4. Run it and try to change their values

As seen in the screenshot, the one in retainer did not change it’s value and the second did.
Everything else including events seems to work fine.

Is there any workaround for that?