[OJS] Native XML Import/Export fails on submission files

I’m having some problems trying to export issues from a journal in one instance of OJS 3.3.0-3 and import them into a new, empty journal in a different OJS instance of the same version. The export completes fine with no errors, but when I try to import the issues XML file in the new journal I get:

[Thu Aug 26 13:55:56.253585 2021] [php7:error] [client] PHP Fatal error:  
Uncaught Exception: Submission file added to review round that does not 
exist. in /ojs/lib/pkp/classes/services/PKPSubmissionFileService.inc.php:347
Stack trace:
#0 /ojs/lib/pkp/plugins/importexport/native/filter/NativeXmlSubmissionFileFilter.inc.php(207): PKP\\Services\\PKPSubmissionFileService->add(Object(SubmissionFile), Object(Request))
#1 /ojs/lib/pkp/plugins/importexport/native/filter/NativeImportFilter.inc.php(60): NativeXmlSubmissionFileFilter->handleElement(Object(DOMElement))
#2 /ojs/lib/pkp/classes/filter/Filter.inc.php(449): NativeImportFilter->process(Object(DOMDocument))
#3 /ojs/lib/pkp/plugins/importexport/native/filter/NativeXmlSubmissionFilter.inc.php(169): Filter->execute(Object(DOMDocument))
#4 /ojs/lib/pkp/plugins/importexport/native/filter/NativeXmlSubmissionFilter.i in /ojs/lib/pkp/classes/services/PKPSubmissionFileService.inc.php on line 347 

I’ve looked through the existing journal for the problematic submission, but I’m not sure how to find it. Any help would be appreciated.