EOS R5 Mark II stopped sending photos to computer while tether capturing.

[JBLCI1]

My R5 MkII stopped sending photos to my computer while tether capturing with Lightroom Classic. LrC can still trigger the R5, and I can still manually import photos while it's tethered. The photo count flashes as though it's trying to save the image. It successfully saves the image locally on the SD but fails to send it to the computer. This issue started seemingly out of nowhere. I used the R5, tethered, the day before with no issue. I do a lot of high-volume shooting, so immediate feedback is essential for my workflow. 

Troubleshooting so far:

Restarted everything, R5 Firmware updated, checked for computer and LrC updates, tried alt cables (original cables and tethering work on an R6 MkII), disabled all communication settings, reset communication settings. 

EOSutility is not installed on my computer. 

I know there's a popular idea that the cable is charging the camera, causing it to not send data. I haven't had an issue with this before - I am getting a dummy battery to test this theory. 

Hardware - Firmware - Software 

Camera: R5 MkII purchased a few months ago; firmware was 1.1.1. when issue presented itself, updated to 1.3.1 as part of troubleshooting. 

Tether cables: Canon C-to-C cable that came with the body to a Tether Tools C-to-C extension cable.

Computer: MacBook M3 Pro - macOS Tahoe 26.5.1 - current version as of time of post. 

LrC: 15.4.1 - current version as of time of post. 

Any help here is appreciated!

[JBLCI1]

I haven't been able to fix it yet. Will update when I do. 

[JBLCI1]

I started using EOS Utility 3 to auto-import to LrC as a current workaround. Nothing suggested has worked to fix this issue. Currently exploring options with Adobe chat. 

[continuousone]

Same thing happened to me. Please update this post when you do find out. Thank you for posting?

[liz12345]

This is the only way I could get it to work:

Problem: Latest LR was connecting but images were not actually coming through. Could work around using Utility & auto update but not tether.

Short answer, don’t update..

Solution:
Need to go back to previous version of LR, not 15.4. Images will then load into LR correctly but utility 3 must not be open when you start tether.
Utility 3 can be on computer if it’s not on when LR loads. Camera won’t connect to LR tether if UTILITY is open.
You can use utility 3 auto update option if you open it first and then don’t try to tether but auto import instead