There's definitely a bit of affection between it's not imagined but Rouge one takes place over such a short time frame, I imagine it to 2 days or less maybe someone knows exactly, that if they did manage to fall in love or even stopped for a kiss anyone else would have be like we do not have time for romance right now.
I think the reshoots took out the story line rather than added it as the official cut has them separated on Scarif for a period where as there are pre reshoots scenes of them back on the beach with the plans running so it seemed that ending kept them together longer or throughout assuming they had to upload the plans back on the beach or try to fly off planet with them.
I think Gareth Edwards said he originally didn't think they could go through with killing everyone so the pre reshoots might have ended with them making it off planet with plans.