Substitutions just after putinside/antiputinside may fail about form HOT 2 CLOSED

The problem of the following code may have the same origin:

CF f;
S x;
L F = 1;
$a = f;
inside $a;
  putinside f,x;
endinside;
*inside $a; endinside;  * <-- (1) workaround
P "$a=%$", $a;
$a = f($a);
P "$a=%$", $a;
.end

which gives

$a=f*f(1)
$a=0*f(f*f(1))*pi_^14

Expected to be

$a=f*f(1)
$a=f(f*f(1))

from form.

The problem of the $-variables $a=0*f(f*f(1))*pi_^14 seems to be related to the issue of nested functions #106 (also introduced by 8ee418f).

from form.