Openlitespeed v1.7.19 timing out with file downloads

Hello. I have several clients with Woocommerce stores selling digital downloads, and I noticed something when my servers (which are managed via RunCloud) updated to version 1.7.19 of Openlitespeed.

Their customers reported that file downloads were not completing or getting corrupted. I ran some tests and found out that downloads were getting stuck right at the beginning, usually at 128 kilobytes or something.

I also have a staging site where I run Loco Translate, even trying to download a small translation file (po/mo) via Loco Translate gets stuck.

I have reported the issue to the RunCloud team and they said they would investigate, but in the meantime I was advised to downgrade to version 1.7.18 and mark the Openlitespeed package as hold so as to not be upgraded automatically.

And since Runcloud uses its own packaged version of Openlitespeed I am not sure if this download issue is related to Openlitespeed or RunCloud, or even something else entirely.

I have not tested this issue on a standalone Openlitespeed server. And version 1.7.19’s changelog states some things that perhaps could be related to the this problem, but I’m not sure.

• [Security] More strict header validations
• [Security] Detect HTTP/2 repaid reset attack and disable HTTP/2 for attacking IP.
• [Improve] Update libmodsecurity to 3.0.11
• [Bug Fix] Fix a HTTP/3 integration issue that causes high CPU usage.
• [Bug Fix] Rewrite rule configured in parent directory is disabled due to an empty .htaccess.
• [Bug Fix] Address a compatibility issue with Ruby application using Rack 3.0+.
• [Bug Fix] Address issue in serving a HTTP range request.