strange behaviour with $PROP_r1 value in a table

["Fraga, Eric" <e.fraga@ucl.ac.uk>]

Hello,

I am trying to have an entry in a table use a value of a PROPERTY.
Every time I try to enter, say,

:=$PROP_r1

into a table, the r1 becomes @1$18.  I have tried this with emacs -Q.  I
am using emacs from git (as of a week or two ago) and org that comes
with it.

Here is what I get:

--8<---------------cut here---------------start------------->8---
#+property: r1 0.95

| value | #ERROR |
#+TBLFM: @1$2=$PROP_@1$18
--8<---------------cut here---------------end--------------->8---

The @1$18, by the way, is consistent regardless of where in a table I
might be trying to insert the expression.

If I change the property name to 'recovery' instead of 'r1', everything
works as expected.

Has anybody seen anything similar?

Thank you,
eric
-- 
: Eric S Fraga, with org 9.7.10-5ebd97 in Emacs 31.0.50