This such utter tosh. I've worked in early years for a very long time.
You can't be overly attached to a baby / toddler.
It's been proven that the thing that impacts children isn't too much love/ attachment but slightly neurotic anxious parenting - always stepping in when they don't need you/ helicopter parenting but even that is further down the line.
Please don't become less attatchment led with your child because of this it's the worst thing you could do.
At your LOs age it's totally normal to be mistrusting of new secondary caregivers.
The very worst scenario of this I've seen was only resolved by a change of key worker - I was new and the child bonded to me instantly. The manager tried to encourage the child to have a different key worker for their development but it always resulted in them being picked up.
What you can do ultimately depends on what you can do realistically with work etc.
Are you able to start off with shorter nursery sessions? And build them?
Can they take in a special item from home?
They're a bit young for visual timers but I'd definitely have one of those.
Set up leaving and arrival rituals.
Would nursery allow you to have a picture of their key worker at home so you can talk about them on non nursery days?
Also consider a childminder - a smaller home setting is easier for some children. They can have more attention and from their home to another home can feel very different to a nursery.