Graphql request with srcset(sizes:["1x", "2x"]) craft becomes unresponsive and times out (503)

Description

I'm trying to query an asset with grapqhl srcset but craft times out or stops responding to any requests (also in the admin section). It's definitely the srcset attribute as if I remove it, query returns fine and very fast.

 headerAsset {
  id
  title
  url
  srcset(sizes:["1x", "2x"])
}

I also tried something like this but didn't help:

headerAsset @transform(format: "jpg") {
                  id
                  title
                  url
                  srcset(sizes:["1x", "2x"])
                }

Steps to reproduce

1. Update existing craft installation.
2. Try to query srcset on an asset in graphql.

Additional info

• Craft version: 3.5.15.1 Pro
• PHP version: 7.4.12
• Database driver & version: MySQL 5.7.26
• Image driver & version | Imagick 3.4.4 (ImageMagick 7.0.10-10)
• Plugins & versions: Craft Reporter | 1.5.5, GraphQL Srcset | 1.0.5 (also tested with this plugin deactivated), Redactor | 2.8.3

Start by reproducing the GraphQL asset query with srcset(sizes:["1x", "2x"]) on the reported Craft 3.5.15.1 setup, then compare it with the same query without srcset and with GraphQL Srcset deactivated. No source file or test is named; done means the query and admin requests no longer time out with a 503.