No HDMI output on SharkByte VRX.

[timstrr]

After flashing backpack 1.3 to the module in my Sharkbyte VRX it no longer outputs video from the HDMI. All other status lights looked correct.
De-soldering the module or rolling back to 1.1 returned the HDMI output.
The module is the Happymodel EP82 VRX-Backpack, but I also tried a EP2 with a broken antenna with the same results.