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HI there!
I am using JIRA at work and I was not able to copy or paste anything in their edit boxes.
I blamed them obviously for everything. They deserve it.
But today I disabled the blocker on their site (it's not catching anything there) and I realized I can copy and paste in the any JIRA web page.

Is this a bug or a filter issue?

It's good you figured out the copy-paste issue in JIRA! While blaming them first might be a knee-jerk reaction, it's great you took the initiative to troubleshoot further.

In this case, it's more likely a browser extension issue than a JIRA bug or filter. When you disabled the blocker on the JIRA site, it essentially stopped an extension from interfering with JIRA's functionality. This suggests the blocker was causing the problem.
Copy-Paste Functionality Across Pages: The fact that you can now copy and paste across all JIRA web pages further strengthens the case for an extension issue. A JIRA bug or filter would likely only affect specific functionalities or areas within JIRA.