Bitbucket backend firing several identical requests

**Describe the bug**
I've recently migrated repository from github to bitbucket and to my surprise I've quickly exhausted API limit. I've checked that bitbucket has lower api request limit (1000requests/h compared to github's 5000requests/h). However, I was surprised that the limit exceeded so fast. Upon further investigation I've noticed in Chrome's network tab that when visiting collection entry (blog post). Several requests to my branch (qa - on attached screenshot) are being fired in rapid succession and both request as well as response seems to be identical for all of them. I couldn't find any info about it so I assume it might be a bug.

**To Reproduce**
Connect CMS with bitbucket backend and got CMS panel (/admin). Turn on chrome dev tools and select network. Go to entry within collection. You should be able to see several requests (with branch name, on screenshot - qa) being fired.

**Applicable Versions:**

Netlify CMS version: netlify-cms-app 2.12.12, netlify-cms-core 2.26.0, netlify-cms 2.10.48
Git provider: Bitbucket
OS: macOS Catalina v10.15.3
Browser version: Chrome 80.0.3987.149

**CMS configuration:**
Not related to the error