|Just auto-log it!|
There are two broad camps that have formed:
(1) Those who are going to avoid using FT-8 until LoTW is sorted out. I've tended to fall into this group - until today.
(2) Those who are going through protracted processes to 'map' FT-8 to 'Data' (unlikely to be confirmed in the same way by the other station, and thus rather futile).
The second camp seem to be a group of people looking for a problem. All they need do is use the logging feature of WSJT-X and keep the ADIF file thus generated until LoTW accepts the mode, where it can be uploaded with, one hopes, no problem.