I am not new to Joomla but in the midst of moving old sites from J3 to J4 and eventually to J5.
I moved all my articles from K2 to Joomla core.
I thought of trying J5 since your extension supports it, why not go with the latest and greatest.
As for J5 being buggy or not, that should be the developers responsibility to fix it, we as end user would always be willing to try the latest version and give feedback so the developers could improve it.
I think we, as early testers, need to be encouraged to try out the latest.
Thanks for resolving the issue anyway.
Qamar.