virtualbox.org

this is due to a bug in virtualbox where it doesn't remember the UEFI configuration (in NVRAM) unless you enable it via a hidden setting.

here's the bug:
virtualbox (dot) org (slash) ticket (slash) 14279

(ugh, assinine posting rule)

please go there an indicate that you ran into this issue.

I'm afraid that the ticket you linked to doesn't have a great relationship to this thread.