Impacted versions: Odoo 13.0-20201112 (Community Edition)

Steps to reproduce: Call external source as qr code provider - example: img t-att-src https://api.qrserver.com/v1/create-qr-code/?data=%s&size=%sx%s&ecc=%s'

I tried to deploy a flask server which is also sends back a generated QR Code - there is the same problem, so its not because of an external source.

i saw in the serverlogs the requests came to fast inside, i have feeling like odoo is not waiting for the response of the first request.

Is there something i can do like a time.sleep(2) where the requests are sent? If yes on which place in the code.

Current behavior: qr-codes are just coming for every second/third requested items back.

Expected behavior: it should come for every item a qr-code back.