I have comment only access on a project. Sometimes I have a box where I can comment, and sometimes I don't.

It's not consistent either, right now it seems if I click on "Metrics" the first metric I open allows comments. any clicks after that don't.

See screenshot where I can't comment:

Then where I click out and back into metrics and I can comment again:

Sorry for the bug report over the top of it! I wasn't sure how to hide it while taking screenshots