@Yaron_Koren Welcome. Could you please make a 1.3.1 release of the extension?
Yes. I have changed the signature: https://gerrit.wikimedia.org/r/c/mediawiki/extensions/DataTransfer/+/757021/1..2/includes/specials/DT_ImportSpreadsheet.php
Well, I tested and fixed on MediaWiki 1.35, PHP 7.4. The original author of this task used MW 1.34, PHP 7.2. But I don't think this is really important. I believe the functionality is actually broken up to the latest extension and MW versions and in any PHP version.
Tue, Jan 25
Seems to be caused by rEDTRe27e04b274bf14e2ada5609be941641f0170c1c7
Thu, Jan 20
The team at Hallo Welt! GmbH / BlueSpice is maintaining Extension:NSFileRepo. We requested maintainership a couple of years ago from @Jdpond. We do not maintain Extension:DiscussionThreading. From my point of view you can archive this extension. Thanks.
Wed, Jan 19
Tue, Jan 18
Thanks for the very quick response! I will create a new ticket if required.
Fri, Jan 14
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Dec 23 2021
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Dec 17 2021
Okay, thanks for the feedback. BlueSpice team will deliver those patches in their legacy packages anyways.