I just did a clean install of drupal 8.2.4 using the simple install profile. This installs the site with the stark theme enabled by default. Enabling and setting the bootstrap theme directly after the clean install, going to structure->blocks you'll see the sidebar regions are missing.

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kriboogh created an issue. See original summary.

kriboogh’s picture

Version: 8.x-3.x-dev » 8.x-3.0
kriboogh’s picture

Status: Active » Closed (cannot reproduce)

Ok nvermind, installed it again and now they are there.