Dad struggling with 1 year old

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Hello! So first of all I feel awful on my partner (babys dad) for feeling this way, and I just want some ideas from anyone who's experienced something similar on how to make this better for everyone.
Our son is 15 month old and I'm the one who is with him most of the time, I do bed time every night apart from when I'm at work late (once or twice a week). Baby does come to me and cries for me, but naturally because I'm with him the most. My partner works full time.
With me now being at work (just part time), my partner is struggling because baby gets so unsettled at times, especially bed time and he just screams and screams until I come home and he settles off to sleep.
My partner is deflated because he thinks the baby hates him and I'm stressed at work knowing that things might not be going so well.
It's stressful for all of us. Has anyone had this? I know that it'll get better in time but I'm more worried about my partner just distancing himself

Yes, heard it both ways round, if dad is the one who works less, and the favourite parent can change round later on, regardless of who works more. Don't know whether attending a particular group, say on a Saturday, would be helpful for him, so he take LO, while you have a lie in, and then you meet at the park or whatever after?
Also some parents found it helpful to try to meet with other couples who have kids of a similar age. One dad said it really helped him, because he felt bad that he just didn't feel like a natural dad, he'd been brought up to think it was weird for a man to want to take care of kids. Many women will have babysat when they were younger, so we're more likely (not always, before anyone calls sexism) to have some childcare experience.
Are his parents nearby? Could they go out with him and LO-he might feel more confident if he's worried about not knowing what to do. My husband used to really like getting ideas for play/toys from the grandparents.

On the nights you do bedtimes- 5 nights? Is he around could he do some of the routine so its less daunting fot baby? Eventually leading to an alternative night situation? He has to get his one way of working with and settling baby,it might look different to yours

Our DC definitely had a preferred parent when that age.
DD1 preferred DH as he did most bed time while I worked.
DD 2 was me as I worked different job and was at home at that point.
Stopped when DH took 12 months off to be SAHP when they were 4 and 5.
When he returned to work we took it in turns to take time off for illness etc. (him the first day, me the second day, back to school day 3).
I suggest encouraging time the 2 of them together, maybe swimming lessons or something that is just their time.
Also suggest you go out more so they learn to manage bed time together.
Good Luck