Well this is unfortunate.
I didn’t realise there was more than one security patch per month (based on both Fairphone and /e/'s somewhat unhelpful wording). It looks like FP5.UT2Q.B.125 actually uses ASPL 2025-06-05 - 4 days newer than the patch included in /e/OS 3.0.4.
I don’t think I can wait any longer for the next /e/OS update so I’m going to have to reinstall FPOS for the time being. I’ll keep an ear out for 3.0.5 (or whatever comes next) so that I can make the switch proper without sacrificing the ability to access my bank account 