Access to Revisions of Group Content is Broken

Yeah that's because you run an older Symfony version. I'll update it to use the old notation so that it works with older versions of Drupal. What version were you on @kay64?

This adds tests and uses the old notation.

Tests confirm this works, so committing on v2/3. I will not be fixing this for v1 as the API does not allow for a simple approach as seen in the patch.

Automatically closed - issue fixed for 2 weeks with no activity.

Patch is not applying to 3.2.2 group. However, do I understand that this is not yet merged into master despite being in Fixed state?
ps. apologies, I'm not that familiar with nowadays development tools and etc. just small bits from old times when SVN was the king :)

Based on the above, it seems this fix is already in all Group v2 and v3, so just using Group 2 or 3 (not 1) should be sufficient. If you're still seeing a problem with this, you should create a new ticket. :)