tests/comparators/test_ocaml.py::test_diff fails with ocaml-4.12.0-3.fc35.x86_64

I assume that this is related to the ocaml version. Debian has 4.11:

(Pdb) p print(seen)
@@ -1,5 +1,5 @@
-Unit name: Test1
+Unit name: Test2
 Interfaces imported:
-	69a7449a2ee894ef85f1a4d8645e8051	Test1
+	187969740b6c403b926a8d81613601ae	Test2
 	4b04b4eda19aa722df365141895fb347	Stdlib
 	b6c6694955e10001aed267571104a961	CamlinternalFormatBasics

None
(Pdb) p print(expected)
@@ -1,5 +1,5 @@
-Unit name: Test1
+Unit name: Test2
 Interfaces imported:
-	3e47d8b00458748ef1a9311764531b2c	Test1
+	de7049745527b20997c517c338bb83cb	Test2
 	c21c5d26416461b543321872a551ea0d	Stdlib
 	3a3ca1838627f7762f49679ce0278ad1	CamlinternalFormatBasics

None

Should the test do f's/[0-9a-f]{{32}}/{" " * 32}/' ?