Unable to resume a download in Safari

I just talked with a senior adviser, and she has sent both the screen recording and the log file to the engineers and we'll see how it goes. Surprisingly, the adviser used her Mac to test and she did not have problem resuming a download. I am using FileVault while she does not, so I wonder whether the FileVault is making a difference here.

Thank you for your reply. I created a fresh account, entered the safe mode and disabled all the Safari plug-ins and extensions. However, the problem still persists. I tried using Safari on iPadOS to download the same test file, and surprisingly Safari on iPadOS has no problem resuming the download. It is hard for me to believe that MacOS Safari has no bona-fide "resume download" feature while iPadOS Safari does. So it might be a bug for MacOS Safari?

If you can also verify the problem on your machine, I will appreciate it if you could submit a bug report (if you have a developer account), a feedback or any other kind of communications that help escalate the issue to the Apple engineers. I submitted one earlier, but a single feedback from a not-so-important user may not be that helpful.

Attached is the link to the youtube video I recorded when I replicated the bug in the fresh account, safe mode, with all plug-ins and extensions disabled. https://youtu.be/7L31oYx-HwU

Thanks!

I noticed the following errors in console whenever I am downloading a file, which I suspect might be related to the failure to resume:

error 23:16:00.720670-0400 Safari Could not set download fraction completed attribute with POSIX error code: 2

And when I try to resume a paused download, there is the following error:

error 23:17:00.733613-0400 Safari WK2 download: cannot resume download, reloading

I will appreciate any idea about what might be wrong!

I’m not running any vpn and I tried uninstalling the anti-virus program but it did not solve the problem.

An incomplete list of things I tried (but none of them solved the problem):

Quit Dropbox: nothing happened

Uninstall Norton and disable system firewall: nothing happened

Decrypt FileVault: nothing happened (always encrypted by T2 security chip anyway)

Download file into an exFAT usb drive: nothing happened

Download file into an HFS+ formatted usb drive: nothing happened

Grant many apps whole disk access (including Safari): nothing happened

Use iphone hotspot instead of home WiFi: nothing happened

Create a new MacOS account and boot in safe mode, and also disable all Safari extensions and plug-ins: nothing happened

I know I can work around the problem by using Chrome, Folx or any other download manager. But I am becoming obsessive as I don’t want my Safari to have such primitive problem lingering around...

Thank you for sharing your idea!

Thank you for the suggestion.