WARNING: 3.5.1-dev current git staging breaks sites:

I have my localhost test installation with Joomla git and CB 2.0.14 and a few CB plugin is working fine with Joomla 3.5.0 tag checkout, but switching to master I get blank page with:

Error displaying the error page: Application Instantiation Error: Application Instantiation Error

Expected result

Working website

Actual result

Error displaying the error page: Application Instantiation Error: Application Instantiation Error

in front-end and admin area.

System information (as much as possible)

PHP 7.0.4, Mysql 5.5, git staging branch

Additional comments

Reverting this commit 943f2e9 fixes my issue.

I have not yet debugged further the reason, as I'm waiting for comment from @mbabker on the commit thread.

However, as I see Joomla PLT merging PRs too quickly and twitter 3.5.1 noises, I wonder if there is a panic mode and would like to warn that a rush release with that commit would break many sites.