Sounds good thank you! GitHub issue works. I think it might be some sort of edge case cause you’re the first to report on it. And I haven’t run into myself.
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I was able to get to it today after all; and, I was indeed able to repeat the problem. Here's the link to the issue in I logged in Github. All do what I can to help you figure it out; and I'm looking forward to hearing what makes it an edge case; but otherwise, good luck! 😉

GitHub
Export Transaction fails (Testnet4) · Issue #449 · bitcoinppl/cove
Attempting to export a transaction to a PSBT file from a watch-only wallet for the purpose of signing externally fails to generate the PSBT file. T...
BTW, I doubt there's anything you can do about it, but it looks to me like someone's mining your Github issues looking for a sucker they can 'help':
https://github.com/example32/support/issues/97