Project, upgraded from 5.3.2 to 5.4.1, crashes everytime i try to open any bluerprint/widget

Thank you for your reply. Like I said, thankfully no working progress I have lost. I originally made a copy of the project when upgrading to 5.4.1, so the original 5.3.2 project is untouched, but I haven’t had time to do anything on 5.4.1 yet, as I ran into the problem described immediately after the upgrade.
I deleted the specified folders, generated visual studio files just in case, recompiled the project, and it didn’t help. I keep looking for a solution to the problem, no guesses yet.
UPD: Important to mention, i think, is that CPP code compiles well, no errors there.

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