From you original post you are showing a summenote lite input, if BS5 then change to bootstrap in the properties panel. Error is probably because it is looking for BS 4 files and you are BS5
maybe, the error undoubtedly comes form an incompatibility with summernote and BS4.
guess the solution is switch to beta or wait for it to become full release
I’m nearing the end of the tutorial and I’ve got the same issue except without the errors mentioned previously (I’ll post what I have below but it doesn’t seem critical). Version 6.5 and Bootstrap 5. If I open it in any web browser I get the first picture, with the 2 text areas in “Description”. Somehow my developer tools in Chrome set itself to Responsive mode, and so by chance I discovered that Summernote works (2nd picture) when viewing it in that manner, I guess being emulated as a tablet or something (I get a black dot instead of the normal cursor).
I don’t know if I’m making sense with my description. It doesn’t work through the browser normally, but it does work with developer tools open as it’s running in tablet mode which is somehow different.