Sadly, yes.
I worked on an extension deployed to Firefox and Chrome, initially, Firefox was taking around two days to accept changes, while the app was being released on Chrome pretty fast (taking a couple of hours), at that time, the extension was built in TypeScript without minification, my guess is that this lack of minification helped to get changes accepted on Chrome.
After some time, the extension was migrated to Scala (thanks god for scalajs), as Firefox asks for the source code while submitting updates, I guess this change was not a problem, it was being accepted on Chrome as well.
Some updates later, Chrome rejected an update with no clear reasons (it was a 1 line change to fix a bug), after trying to fix everything we could and until it got accepted, this review process took more than 3 weeks!
After the first rejection on Chrome, most updates started taking days to get reviewed (a week long was common), the last update was rejected again with no clear reason, i tried contacting support (good luck trying to find the email, not unusual in google products) and even offered to share the source code or even open source it to simplify the review process, they didn't commented on this and just gave some hints about the rejection.
I have the feeling they flagged our extension since the first rejection and that causes the delays but I don't what could have possibly cause your delays.
You can try contacting support on chromewebstore-dev-support [at] google.com
Good luck!