I did not know
That the version on HBO max is a remaster and that it goes back to 4:3, rather than the widescreen DVD versions. I know that it was broadcast in widescreen but that there was always hope that people would see the widescreen version some day, and then there ended up being issues with how the effects looked in the widescreen versions.
Also, I guess there are episode order issues with B5? I only knew about that with Crusade, aside from the movies and to back-to-back episodes (and I forget which two those were). https://babylon5.fandom.com/wiki/Viewing_Order