12-28-2020, 05:22 AM (This post was last modified: 12-28-2020, 05:22 AM by GasmoN.)
Yes, I just discovered what is causing this issue.
So, when you go to edit your RSS Entry and select icon, it will upldate without any problems.
BUT, if you don't select icon (Check empty radio box) it will cause this error.
Video:
This is the result now after trying to edit Feed. https://prnt.sc/wikv73
The only difference now is that it doesn't matter if I select icon for post or not, this will pop up.