Azure backend is inconsistent

=== FAIL: registry/storage/driver/azure TestAzureDriverSuite/TestList1200Files (47.99s)
    testsuites.go:629: 
        	Error Trace:	/builds/gitlab-org/container-registry/registry/storage/driver/testsuites/testsuites.go:629
        	            				/builds/gitlab-org/container-registry/registry/storage/driver/testsuites/testsuites.go:607
        	Error:      	Not equal: 
        	            	expected: []string{"/i.qqe9qw"}
        	            	actual  : []string{}
        	            	
        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -1,3 +1,2 @@
        	            	-([]string) (len=1) {
        	            	- (string) (len=9) "/i.qqe9qw"
        	            	+([]string) {
        	            	 }
        	Test:       	TestAzureDriverSuite/TestList1200Files
    --- FAIL: TestAzureDriverSuite/TestList1200Files (47.99s)

Job #8820694250 failed for a591c062: