IMPORTANT INFORMATION BY @pigglypoof:
Anything new you add will probably get jumbled up together with the old stuff. My already read list started reconstructing, but the dates the manga were added are all marked as today not the actual dates I added them back in 2016. So whatever they're doing to fix this seems to be a very slow process that re-adds each manga back in your list and not just reverting your lists back to what they used to be.
ADD-ON BY @TerracottaPie:
Everything is getting added back under today's date but the dates are slowly getting fixed now as well. Some of the dates are getting changed from 2026-01-26 09:33 to the correct ones in 2016 for me now.

Since the lists are slowly coming back, can I add smth to my "reading" or will it compromise the come back of my full list?