I'm also interested to know I haven't tried it yet but someone answered your question in your previous thread.
Check them here
https://bitcointalk.org/index.php?topic=5487691.msg63769874#msg63769874I heard that it only works on the latest version if your current Bitcoin core is v21 you might need to upgrade it to the latest version to make sure the unsigned PSBT generated from Electrum will work on Bitcoin core.
Perhaps you have now revealed a reason some says yes and some say no.
2 persons have said it is fine to load electrum generated psbt into bitcoin core.
And 2 have said this can cause problems but didnt say why or what problems.
Maybe that explains the reason.
Those that tried it and said it works fine perhaps only used the very latest version?
I don't want to touch the airgapped machine at all so installing the very latest bitcoin core is not something I can test.
I want to test this on the v21 but I wonder if I can cause some issue that I can then not rectify after.
I suppose I could try it and compare the signed output hex with the hex signing on an electrum wallet produces.
Then if both are exactly identical it is proven to work with zero possible issues?
Or am I still missing deeper potential issues?