static-plugins is broken in profiled ways

There is something funny going on with the static-plugins test:

--- /dev/null   2018-09-20 23:11:48.441118459 -0400
+++ "/tmp/ghctest-fho1bbc6/test   spaces/testsuite/tests/plugins/static-plugins.run/static-plugins.run.stderr.normalised"       2019-06-11 17:05:31.321177386 -0400
@@ -0,0 +1,34 @@
+
+when making flags consistent: warning:
+    Enabling -prof, because -fobject-code is enabled and GHCi is profiled
+
+static-plugins-module.hs:1:8:
+    Bad interface file: /home/ben/ghc-trees/ghc/_build/stage1/lib/../lib/x86_64-linux-ghc-8.9.0.20190611/base-4.13.0.0/Prelude.hi
+        mismatched interface file ways (wanted "p", got "")
+  |
+1 | module Main where
+  |        ^^^^
+
+static-plugins-module.hs:2:8:
+    Variable not in scope: print :: [GHC.Types.Char] -> t
+  |
+2 | main = print "Hello world!"
+  |        ^^^^^
+
+static-plugins-module.hs:2:8:
+    Variable not in scope: print :: [GHC.Types.Char] -> t
+  |
+2 | main = print "Hello world!"
+  |        ^^^^^
+
+static-plugins-module.hs:2:8:
+    Variable not in scope: print :: [GHC.Types.Char] -> t
+  |
+2 | main = print "Hello world!"
+  |        ^^^^^
+
+static-plugins-module.hs:2:8:
+    Variable not in scope: print :: [GHC.Types.Char] -> t
+  |
+2 | main = print "Hello world!"
+  |        ^^^^^

Why did we load an unprofiled interface file when we were invoked with profiling?