htaccess rule for redirecting homepage breaks other redirect rules

Hello there,

I just did a redesign of a website. New domain, new structure.

For SEO purposes I know I have to redirect the old URL to the new domain. So i toyed a bit with screaming frog SEO spider and Google analytics and got a nice list of pages that need to be redirected.

I need to redirect only about 30 pages.
I used this syntax in .htaccess.

Redirect 301 /annalisa-mantovani-2/ https://www.annalisamantovani.com/bio/
Redirect 301 /progetti/ https://www.annalisamantovani.com/portfolio/

And It works.

ie: https://svistadecorazionigrafiche.com/progetti (OLD URL) correctly redirects to https://www.annalisamantovani.com/portfolio (NEW URL)

But there’s an issue that occurs if I add the homepage redirect. If I add

Redirect 301 / https://www.annalisamantovani.com

The homepage gets redirected correctly but all the other redirects stop working.

ie: https://svistadecorazionigrafiche.com/progetti redirects to https://www.annalisamantovani.comprogetti/ (and It clearly doesn’t work)

The htaccess file on the old domain looks pretty plain and simple, like straight out of the codex. Here’s how it looks:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

(... redirect rules)
Redirect 301 /Progetti/quadri-schiena-donna/ https://www.annalisamantovani.com/portfolio/vivi/
Redirect 301 /Progetti/sanbucus-nigra/ https://www.annalisamantovani.com/portfolio/sambucus-nigra/

</IfModule>

# END WordPress

Probably it’s an easy fix that has something to do with the code at the beginning of the htaccess. But I can’t understand that even after some hard googling.

If someone that knows more than me can point me in the right direction it would be great.

Thank you!