No worries. With these reports on the internet, it’s hard to know what has and has not been resolved, especially if the bug was reported in 2020.
I still don’t see how you can pass flags within the TrueNAS GUI to the replication process though. So since I played around with record sizes on this end I decided to play it safe, nuked the receiving remote from orbit and started the replication from scratch. It’ll take a while but it should also be bugproof since all recordsizes, sVDEV parameters, etc will match.
I hope iXsystems can chime in at some point re: flag use and / or the bug itself, however.
I didn’t see it because I was looking for a spot to put the --large flag in (sort of like the vfs fruit, etc. back in the more complicated days of supporting time machine) but you are right, the GUI has the feature as a one-time use check-box. Luckily mine was already checked!