(add_)search_rules not properly working

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Using asr on a path and then calling an executable on that path does not work, instead it outputs:
"calc_costs skrewed up. file a trouble report (tr)"
Calling the executable using its full path and then calling it as if it were on the search path works.

To reproduce / example:
On a freshly coldbooted Multics installation (with a test.c file):

! asr >sl3p>c_compiler>e
<READY MESSAGE>
! cc test.c
calc_costs skrewed up. file a trouble report (tr)
! >sl3p>c_compiler>e>cc test.c
<READY MESSAGE>
! cc test.c
<READY MESSAGE>

I don't believe this happened in R12.7