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Build regression when using GObject-Introspection 1.81.x

With GNOME/gobject-introspection> 1.81.4 (which should be functionally equivalent to the 1.82.0 stable release), t/structs.t fails:

t/structs.t ................... 
1..6
ok 1
ok 2
Cannot convert record value of unknown type GIMarshallingTestsPointerStruct (94216787708512) to SV at t/structs.t line 26.
# Looks like your test exited with 255 just after 2.
Dubious, test returned 255 (wstat 65280, 0xff00)
Failed 4/6 subtests

The build and tests succeed with GObject-Introspection 1.80.1. Comparing the typelibs from a build with 1.80.1 and a build with 1.81.4, I see that 1.80.1 did not include the glib:type-name, glib:get-type and c:symbol-prefix attributes on the <record> for GIMarshallingTestsPointerStruct:

--- with 1.80.1
+++ with 1.81.4
-    <record name="PointerStruct" c:type="GIMarshallingTestsPointerStruct">
-      <source-position filename="gimarshallingtests.h" line="1460"/>
+    <record name="PointerStruct"
+            c:type="GIMarshallingTestsPointerStruct"
+            glib:type-name="GIMarshallingTestsPointerStruct"
+            glib:get-type="gi_marshalling_tests_pointer_struct_get_type"
+            c:symbol-prefix="pointer_struct">
+      <source-position filename="gimarshallingtests.h" line="1415"/>
       <field name="long_" writable="1">
         <type name="glong" c:type="glong"/>
       </field>

and 1.80.1 recorded its get_type() function as just an ordinary function, whereas 1.81.4 did not:

--- with 1.80.1
+++ with 1.81.4
       </parameters>
     </function>
-    <function name="pointer_struct_get_type"
-              c:identifier="gi_marshalling_tests_pointer_struct_get_type">
-      <source-position filename="gimarshallingtests.h" line="1464"/>
-      <return-value transfer-ownership="none">
-        <type name="GType" c:type="GType"/>
-      </return-value>
-    </function>
     <function name="pointer_struct_returnv"

This is probably a behaviour change in g-ir-scanner, rather than a difference between the versions of gimarshallingtests.[ch] that were used: the code for PointerStruct in the two versions of gimarshallingtests.[ch] seems to be functionally equivalent.

I can work around this by editing the GIR XML in build/GIMarshallingTests-1.0.gir to remove the glib:* attributes:

--- with 1.81.4
+++ workaround
     <record name="PointerStruct"
             c:type="GIMarshallingTestsPointerStruct"
-            glib:type-name="GIMarshallingTestsPointerStruct"
-            glib:get-type="gi_marshalling_tests_pointer_struct_get_type"
             c:symbol-prefix="pointer_struct">

and recompiling build/GIMarshallingTests-1.0.typelib from the edited file, which makes the test pass. I'm fairly sure that isn't a solution, but hopefully it can point someone who is better at g-i / Perl to where the problem might be?

cc @ebassi