Probable newly found 5.11.4 regression

I executed some code that was in the correspondence about the charnames 
regression, and got a panic.  The code that causes it is:

use strict;
use charnames ':full';
$x = qr/\N{THAI CHARACTER SARA I}/;

The panic message is: panic: top_env
perl: perl.c:542: perl_destruct: Assertion `PL_scopestack_ix == 1' failed.

Either removing the 'strict' or adding a 'my' to the $x fixes the problem.

• Probable newly found 5.11.4 regression by karl williamson